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        <link:definition>061013 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>061029 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>061032 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>061037 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>061038 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:definition>061040 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>061045 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>061046 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:definition>061048 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>061050 - Document - Risk/Return Summary {Unlabeled} (PACE Large Co Value Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061051 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>061052 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:definition>061053 - Schedule - Expense Example {Transposed}</link:definition>
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      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002971Member1" id="PerformanceTableData_S000002971Member1">
        <link:definition>061056 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002971Member1" id="RiskReturnDetailData_S000002971Member1">
        <link:definition>061057 - Disclosure - Risk/Return Detail Data {Elements} (PACE Large Co Value Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002972Member1" id="RiskReturn_S000002972Member1">
        <link:definition>061058 - Document - Risk/Return Summary {Unlabeled} (PACE Large Co Growth Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002972Member1" id="ShareholderFeesData_S000002972Member1">
        <link:definition>061059 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002972Member1" id="OperatingExpensesData_S000002972Member1">
        <link:definition>061060 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002972Member1" id="ExpenseExample_S000002972Member1">
        <link:definition>061061 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000002972Member1" id="ExpenseExampleNoRedemption_S000002972Member1">
        <link:definition>061062 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002972Member1" id="BarChartData_S000002972Member1">
        <link:definition>061063 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002972Member1" id="PerformanceTableData_S000002972Member1">
        <link:definition>061064 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002972Member1" id="RiskReturnDetailData_S000002972Member1">
        <link:definition>061065 - Disclosure - Risk/Return Detail Data {Elements} (PACE Large Co Growth Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002973Member1" id="RiskReturn_S000002973Member1">
        <link:definition>061066 - Document - Risk/Return Summary {Unlabeled} (PACE Small/Medium Co Value Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002973Member1" id="ShareholderFeesData_S000002973Member1">
        <link:definition>061067 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002973Member1" id="OperatingExpensesData_S000002973Member1">
        <link:definition>061068 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002973Member1" id="ExpenseExample_S000002973Member1">
        <link:definition>061069 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000002973Member1" id="ExpenseExampleNoRedemption_S000002973Member1">
        <link:definition>061070 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002973Member1" id="BarChartData_S000002973Member1">
        <link:definition>061071 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002973Member1" id="PerformanceTableData_S000002973Member1">
        <link:definition>061072 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002973Member1" id="RiskReturnDetailData_S000002973Member1">
        <link:definition>061073 - Disclosure - Risk/Return Detail Data {Elements} (PACE Small/Medium Co Value Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002974Member1" id="RiskReturn_S000002974Member1">
        <link:definition>061074 - Document - Risk/Return Summary {Unlabeled} (PACE Small/Medium Co Growth Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002974Member1" id="ShareholderFeesData_S000002974Member1">
        <link:definition>061075 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002974Member1" id="OperatingExpensesData_S000002974Member1">
        <link:definition>061076 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002974Member1" id="ExpenseExample_S000002974Member1">
        <link:definition>061077 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000002974Member1" id="ExpenseExampleNoRedemption_S000002974Member1">
        <link:definition>061078 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002974Member1" id="BarChartData_S000002974Member1">
        <link:definition>061079 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002974Member1" id="PerformanceTableData_S000002974Member1">
        <link:definition>061080 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002974Member1" id="RiskReturnDetailData_S000002974Member1">
        <link:definition>061081 - Disclosure - Risk/Return Detail Data {Elements} (PACE Small/Medium Co Growth Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002975Member1" id="RiskReturn_S000002975Member1">
        <link:definition>061082 - Document - Risk/Return Summary {Unlabeled} (PACE International Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002975Member1" id="ShareholderFeesData_S000002975Member1">
        <link:definition>061083 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002975Member1" id="OperatingExpensesData_S000002975Member1">
        <link:definition>061084 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002975Member1" id="ExpenseExample_S000002975Member1">
        <link:definition>061085 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000002975Member1" id="ExpenseExampleNoRedemption_S000002975Member1">
        <link:definition>061086 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002975Member1" id="BarChartData_S000002975Member1">
        <link:definition>061087 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002975Member1" id="PerformanceTableData_S000002975Member1">
        <link:definition>061088 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002975Member1" id="RiskReturnDetailData_S000002975Member1">
        <link:definition>061089 - Disclosure - Risk/Return Detail Data {Elements} (PACE International Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002976Member1" id="RiskReturn_S000002976Member1">
        <link:definition>061090 - Document - Risk/Return Summary {Unlabeled} (PACE International Emerging Markets Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002976Member1" id="ShareholderFeesData_S000002976Member1">
        <link:definition>061091 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002976Member1" id="OperatingExpensesData_S000002976Member1">
        <link:definition>061092 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002976Member1" id="ExpenseExample_S000002976Member1">
        <link:definition>061093 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000002976Member1" id="ExpenseExampleNoRedemption_S000002976Member1">
        <link:definition>061094 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002976Member1" id="BarChartData_S000002976Member1">
        <link:definition>061095 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002976Member1" id="PerformanceTableData_S000002976Member1">
        <link:definition>061096 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002976Member1" id="RiskReturnDetailData_S000002976Member1">
        <link:definition>061097 - Disclosure - Risk/Return Detail Data {Elements} (PACE International Emerging Markets Equity Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000006034Member1" id="RiskReturn_S000006034Member1">
        <link:definition>061098 - Document - Risk/Return Summary {Unlabeled} (PACE Global Real Estate Securities Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000006034Member1" id="ShareholderFeesData_S000006034Member1">
        <link:definition>061099 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000006034Member1" id="OperatingExpensesData_S000006034Member1">
        <link:definition>061100 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000006034Member1" id="ExpenseExample_S000006034Member1">
        <link:definition>061101 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000006034Member1" id="ExpenseExampleNoRedemption_S000006034Member1">
        <link:definition>061102 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000006034Member1" id="BarChartData_S000006034Member1">
        <link:definition>061103 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000006034Member1" id="PerformanceTableData_S000006034Member1">
        <link:definition>061104 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000006034Member1" id="RiskReturnDetailData_S000006034Member1">
        <link:definition>061105 - Disclosure - Risk/Return Detail Data {Elements} (PACE Global Real Estate Securities Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000006035Member1" id="RiskReturn_S000006035Member1">
        <link:definition>061106 - Document - Risk/Return Summary {Unlabeled} (PACE Alternative Strategies Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000006035Member1" id="ShareholderFeesData_S000006035Member1">
        <link:definition>061107 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000006035Member1" id="OperatingExpensesData_S000006035Member1">
        <link:definition>061108 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000006035Member1" id="ExpenseExample_S000006035Member1">
        <link:definition>061109 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExampleNoRedemption_S000006035Member1" id="ExpenseExampleNoRedemption_S000006035Member1">
        <link:definition>061110 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000006035Member1" id="BarChartData_S000006035Member1">
        <link:definition>061111 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000006035Member1" id="PerformanceTableData_S000006035Member1">
        <link:definition>061112 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000006035Member1" id="RiskReturnDetailData_S000006035Member1">
        <link:definition>061113 - Disclosure - Risk/Return Detail Data {Elements} (PACE Alternative Strategies Investments - Class A, Class C, Class Y)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002695Member" id="RiskReturn_S000002695Member">
        <link:definition>061114 - Document - Risk/Return Summary {Unlabeled} (PACE Money Market Investments)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002695Member" id="ShareholderFeesData_S000002695Member">
        <link:definition>061115 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002695Member" id="OperatingExpensesData_S000002695Member">
        <link:definition>061116 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002695Member" id="ExpenseExample_S000002695Member">
        <link:definition>061117 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002695Member" id="BarChartData_S000002695Member">
        <link:definition>061118 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002695Member" id="PerformanceTableData_S000002695Member">
        <link:definition>061119 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002695Member" id="RiskReturnDetailData_S000002695Member">
        <link:definition>061120 - Disclosure - Risk/Return Detail Data {Elements} (PACE Money Market Investments)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002696Member2" id="RiskReturn_S000002696Member2">
        <link:definition>061121 - Document - Risk/Return Summary {Unlabeled} (PACE Government Securities Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002696Member2" id="ShareholderFeesData_S000002696Member2">
        <link:definition>061122 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002696Member2" id="OperatingExpensesData_S000002696Member2">
        <link:definition>061123 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002696Member2" id="ExpenseExample_S000002696Member2">
        <link:definition>061124 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002696Member2" id="BarChartData_S000002696Member2">
        <link:definition>061125 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002696Member2" id="PerformanceTableData_S000002696Member2">
        <link:definition>061126 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002696Member2" id="RiskReturnDetailData_S000002696Member2">
        <link:definition>061127 - Disclosure - Risk/Return Detail Data {Elements} (PACE Government Securities Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002697Member2" id="RiskReturn_S000002697Member2">
        <link:definition>061128 - Document - Risk/Return Summary {Unlabeled} (PACE Intermediate Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002697Member2" id="ShareholderFeesData_S000002697Member2">
        <link:definition>061129 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002697Member2" id="OperatingExpensesData_S000002697Member2">
        <link:definition>061130 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002697Member2" id="ExpenseExample_S000002697Member2">
        <link:definition>061131 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002697Member2" id="BarChartData_S000002697Member2">
        <link:definition>061132 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002697Member2" id="PerformanceTableData_S000002697Member2">
        <link:definition>061133 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002697Member2" id="RiskReturnDetailData_S000002697Member2">
        <link:definition>061134 - Disclosure - Risk/Return Detail Data {Elements} (PACE Intermediate Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002698Member2" id="RiskReturn_S000002698Member2">
        <link:definition>061135 - Document - Risk/Return Summary {Unlabeled} (PACE Strategic Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002698Member2" id="ShareholderFeesData_S000002698Member2">
        <link:definition>061136 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002698Member2" id="OperatingExpensesData_S000002698Member2">
        <link:definition>061137 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002698Member2" id="ExpenseExample_S000002698Member2">
        <link:definition>061138 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002698Member2" id="BarChartData_S000002698Member2">
        <link:definition>061139 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002698Member2" id="PerformanceTableData_S000002698Member2">
        <link:definition>061140 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002698Member2" id="RiskReturnDetailData_S000002698Member2">
        <link:definition>061141 - Disclosure - Risk/Return Detail Data {Elements} (PACE Strategic Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002699Member2" id="RiskReturn_S000002699Member2">
        <link:definition>061142 - Document - Risk/Return Summary {Unlabeled} (PACE Municipal Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002699Member2" id="ShareholderFeesData_S000002699Member2">
        <link:definition>061143 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002699Member2" id="OperatingExpensesData_S000002699Member2">
        <link:definition>061144 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002699Member2" id="ExpenseExample_S000002699Member2">
        <link:definition>061145 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002699Member2" id="BarChartData_S000002699Member2">
        <link:definition>061146 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002699Member2" id="PerformanceTableData_S000002699Member2">
        <link:definition>061147 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002699Member2" id="RiskReturnDetailData_S000002699Member2">
        <link:definition>061148 - Disclosure - Risk/Return Detail Data {Elements} (PACE Municipal Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002700Member2" id="RiskReturn_S000002700Member2">
        <link:definition>061149 - Document - Risk/Return Summary {Unlabeled} (PACE International Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002700Member2" id="ShareholderFeesData_S000002700Member2">
        <link:definition>061150 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002700Member2" id="OperatingExpensesData_S000002700Member2">
        <link:definition>061151 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002700Member2" id="ExpenseExample_S000002700Member2">
        <link:definition>061152 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002700Member2" id="BarChartData_S000002700Member2">
        <link:definition>061153 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002700Member2" id="PerformanceTableData_S000002700Member2">
        <link:definition>061154 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002700Member2" id="RiskReturnDetailData_S000002700Member2">
        <link:definition>061155 - Disclosure - Risk/Return Detail Data {Elements} (PACE International Fixed Income Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000006015Member2" id="RiskReturn_S000006015Member2">
        <link:definition>061156 - Document - Risk/Return Summary {Unlabeled} (PACE High Yield Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000006015Member2" id="ShareholderFeesData_S000006015Member2">
        <link:definition>061157 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000006015Member2" id="OperatingExpensesData_S000006015Member2">
        <link:definition>061158 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000006015Member2" id="ExpenseExample_S000006015Member2">
        <link:definition>061159 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000006015Member2" id="BarChartData_S000006015Member2">
        <link:definition>061160 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000006015Member2" id="PerformanceTableData_S000006015Member2">
        <link:definition>061161 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000006015Member2" id="RiskReturnDetailData_S000006015Member2">
        <link:definition>061162 - Disclosure - Risk/Return Detail Data {Elements} (PACE High Yield Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturn_S000002971Member2" id="RiskReturn_S000002971Member2">
        <link:definition>061163 - Document - Risk/Return Summary {Unlabeled} (PACE Large Co Value Equity Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ShareholderFeesData_S000002971Member2" id="ShareholderFeesData_S000002971Member2">
        <link:definition>061164 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/OperatingExpensesData_S000002971Member2" id="OperatingExpensesData_S000002971Member2">
        <link:definition>061165 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/ExpenseExample_S000002971Member2" id="ExpenseExample_S000002971Member2">
        <link:definition>061166 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/BarChartData_S000002971Member2" id="BarChartData_S000002971Member2">
        <link:definition>061167 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/PerformanceTableData_S000002971Member2" id="PerformanceTableData_S000002971Member2">
        <link:definition>061168 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ubs.com/role/RiskReturnDetailData_S000002971Member2" id="RiskReturnDetailData_S000002971Member2">
        <link:definition>061169 - Disclosure - Risk/Return Detail Data {Elements} (PACE Large Co Value Equity Investments - Class P)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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</schema>
