<?xml version="1.0" encoding="us-ascii"?>
<!-- EDGAR Online I-Metrix Xcelerate Risk Return XBRL Schema Document, based on XBRL 2.1  http://www.edgar-online.com/ -->
<!-- Created (UTC): 9/19/2012 5:39:24 PM -->
<!-- XBRL File Set ID: 269afc4b-a75a-4798-bdf0-0dab6e8ab63c -->
<!-- App Version: 3.0.0.183, 6.1.7601.65536, 14.0 -->
<!-- Copyright (c) 2005-2012 EDGAR Online, Inc. All Rights Reserved. -->
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        <link:definition>010005 - Document - Risk/Return Summary {Unlabeled} (LargeCap Growth Fund (Prospectus Summary):)</link:definition>
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        <link:definition>010020 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>010025 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:definition>010030 - Schedule - Annual Total Returns</link:definition>
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        <link:definition>010035 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>050005 - Document - Risk/Return Summary {Unlabeled} (LargeCap Value Fund (Prospectus Summary):)</link:definition>
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        <link:definition>050010 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050015 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050020 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050025 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050030 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050035 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050040 - Disclosure - Risk/Return Detail Data {Elements} (LargeCap Value Fund (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>050045 - Document - Risk/Return Summary {Unlabeled} (MidCap Blend Fund (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050050 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050055 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050060 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050065 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050070 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>050075 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050080 - Disclosure - Risk/Return Detail Data {Elements} (MidCap Blend Fund (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050085 - Document - Risk/Return Summary {Unlabeled} (LargeCap Growth Fund I (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050090 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050095 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050100 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050105 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050110 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050115 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050120 - Disclosure - Risk/Return Detail Data {Elements} (LargeCap Growth Fund I (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>050125 - Document - Risk/Return Summary {Unlabeled} (MidCap Growth Fund (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050130 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>050135 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050140 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050145 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050150 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050155 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050160 - Disclosure - Risk/Return Detail Data {Elements} (MidCap Growth Fund (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>050165 - Document - Risk/Return Summary {Unlabeled} (MidCap Value Fund III (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050170 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/OperatingExpensesData_P0001-S000007080Member" id="OperatingExpensesData_P0001-S000007080Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050175 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExample_P0001-S000007080Member" id="ExpenseExample_P0001-S000007080Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050180 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExampleNoRedemption_P0001-S000007080Member" id="ExpenseExampleNoRedemption_P0001-S000007080Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050185 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/BarChartData_P0001-S000007080Member" id="BarChartData_P0001-S000007080Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050190 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/PerformanceTableData_P0001-S000007080Member" id="PerformanceTableData_P0001-S000007080Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050195 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturnDetailData_P0001-S000007080Member" id="RiskReturnDetailData_P0001-S000007080Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050200 - Disclosure - Risk/Return Detail Data {Elements} (MidCap Value Fund III (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturn_P0001-S000007121Member" id="RiskReturn_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050205 - Document - Risk/Return Summary {Unlabeled} (LargeCap Growth Fund II (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ShareholderFeesData_P0001-S000007121Member" id="ShareholderFeesData_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050210 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/OperatingExpensesData_P0001-S000007121Member" id="OperatingExpensesData_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050215 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExample_P0001-S000007121Member" id="ExpenseExample_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050220 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExampleNoRedemption_P0001-S000007121Member" id="ExpenseExampleNoRedemption_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050225 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/BarChartData_P0001-S000007121Member" id="BarChartData_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050230 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/PerformanceTableData_P0001-S000007121Member" id="PerformanceTableData_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050235 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturnDetailData_P0001-S000007121Member" id="RiskReturnDetailData_P0001-S000007121Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050240 - Disclosure - Risk/Return Detail Data {Elements} (LargeCap Growth Fund II (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturn_P0001-S000007122Member" id="RiskReturn_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050245 - Document - Risk/Return Summary {Unlabeled} (LargeCap Value Fund III (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ShareholderFeesData_P0001-S000007122Member" id="ShareholderFeesData_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050250 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/OperatingExpensesData_P0001-S000007122Member" id="OperatingExpensesData_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050255 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExample_P0001-S000007122Member" id="ExpenseExample_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050260 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExampleNoRedemption_P0001-S000007122Member" id="ExpenseExampleNoRedemption_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050265 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/BarChartData_P0001-S000007122Member" id="BarChartData_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050270 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/PerformanceTableData_P0001-S000007122Member" id="PerformanceTableData_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050275 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturnDetailData_P0001-S000007122Member" id="RiskReturnDetailData_P0001-S000007122Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050280 - Disclosure - Risk/Return Detail Data {Elements} (LargeCap Value Fund III (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturn_P0001-S000007123Member" id="RiskReturn_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050285 - Document - Risk/Return Summary {Unlabeled} (LargeCap Value Fund I (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ShareholderFeesData_P0001-S000007123Member" id="ShareholderFeesData_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050290 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/OperatingExpensesData_P0001-S000007123Member" id="OperatingExpensesData_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050295 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExample_P0001-S000007123Member" id="ExpenseExample_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050300 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExampleNoRedemption_P0001-S000007123Member" id="ExpenseExampleNoRedemption_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050305 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/BarChartData_P0001-S000007123Member" id="BarChartData_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050310 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/PerformanceTableData_P0001-S000007123Member" id="PerformanceTableData_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050315 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturnDetailData_P0001-S000007123Member" id="RiskReturnDetailData_P0001-S000007123Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050320 - Disclosure - Risk/Return Detail Data {Elements} (LargeCap Value Fund I (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturn_P0001-S000007125Member" id="RiskReturn_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050325 - Document - Risk/Return Summary {Unlabeled} (MidCap Growth Fund III (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ShareholderFeesData_P0001-S000007125Member" id="ShareholderFeesData_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050330 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/OperatingExpensesData_P0001-S000007125Member" id="OperatingExpensesData_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050335 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExample_P0001-S000007125Member" id="ExpenseExample_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050340 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExampleNoRedemption_P0001-S000007125Member" id="ExpenseExampleNoRedemption_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050345 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/BarChartData_P0001-S000007125Member" id="BarChartData_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050350 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/PerformanceTableData_P0001-S000007125Member" id="PerformanceTableData_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050355 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturnDetailData_P0001-S000007125Member" id="RiskReturnDetailData_P0001-S000007125Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050360 - Disclosure - Risk/Return Detail Data {Elements} (MidCap Growth Fund III (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturn_P0001-S000007169Member" id="RiskReturn_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050365 - Document - Risk/Return Summary {Unlabeled} (SmallCap Value Fund II (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ShareholderFeesData_P0001-S000007169Member" id="ShareholderFeesData_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050370 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/OperatingExpensesData_P0001-S000007169Member" id="OperatingExpensesData_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050375 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExample_P0001-S000007169Member" id="ExpenseExample_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050380 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ExpenseExampleNoRedemption_P0001-S000007169Member" id="ExpenseExampleNoRedemption_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050385 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/BarChartData_P0001-S000007169Member" id="BarChartData_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050390 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/PerformanceTableData_P0001-S000007169Member" id="PerformanceTableData_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050395 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturnDetailData_P0001-S000007169Member" id="RiskReturnDetailData_P0001-S000007169Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050400 - Disclosure - Risk/Return Detail Data {Elements} (SmallCap Value Fund II (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/RiskReturn_P0001-S000007173Member" id="RiskReturn_P0001-S000007173Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050405 - Document - Risk/Return Summary {Unlabeled} (MidCap Value Fund I (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.principalfunds.com/20120914/role/ShareholderFeesData_P0001-S000007173Member" id="ShareholderFeesData_P0001-S000007173Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>050410 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050415 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:definition>050420 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>050425 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050430 - Schedule - Annual Total Returns</link:definition>
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        <link:definition>050435 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>050440 - Disclosure - Risk/Return Detail Data {Elements} (MidCap Value Fund I (Prospectus Summary):)</link:definition>
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        <link:definition>050445 - Document - Risk/Return Summary {Unlabeled} (SmallCap Growth Fund I (Prospectus Summary):)</link:definition>
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        <link:definition>050450 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050455 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:definition>050460 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>050465 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050470 - Schedule - Annual Total Returns</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>050475 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>050480 - Disclosure - Risk/Return Detail Data {Elements} (SmallCap Growth Fund I (Prospectus Summary):)</link:definition>
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        <link:definition>050485 - Document - Risk/Return Summary {Unlabeled} (SmallCap Growth Fund II (Prospectus Summary):)</link:definition>
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        <link:definition>050490 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050495 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:definition>050500 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>050505 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:definition>050510 - Schedule - Annual Total Returns</link:definition>
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        <link:definition>050515 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>050520 - Disclosure - Risk/Return Detail Data {Elements} (SmallCap Growth Fund II (Prospectus Summary):)</link:definition>
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        <link:definition>050525 - Document - Risk/Return Summary {Unlabeled} (SmallCap Blend Fund (Prospectus Summary):)</link:definition>
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        <link:definition>050530 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050535 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:definition>050540 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>050545 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:definition>050550 - Schedule - Annual Total Returns</link:definition>
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        <link:definition>050555 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>050560 - Disclosure - Risk/Return Detail Data {Elements} (SmallCap Blend Fund (Prospectus Summary):)</link:definition>
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        <link:definition>050565 - Document - Risk/Return Summary {Unlabeled} (Equity Income Fund formerly Equity Income Fund I (Prospectus Summary):)</link:definition>
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        <link:definition>050570 - Schedule - Shareholder Fees</link:definition>
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        <link:definition>050575 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:definition>050580 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:definition>050585 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
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        <link:definition>050590 - Schedule - Annual Total Returns</link:definition>
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        <link:definition>050595 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>050600 - Disclosure - Risk/Return Detail Data {Elements} (Equity Income Fund formerly Equity Income Fund I (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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