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  <rr:ExpenseExampleHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" color="#b04e19" size="3"&gt;&lt;b&gt;Example &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:RiskReturnHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="6"&gt;F&lt;a name="toc413570_1"&gt;&lt;/a&gt;UND SUMMARY &lt;/font&gt;&lt;br/&gt;&lt;p align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="5"&gt;&lt;a name="toc413570_2"&gt;&lt;/a&gt;FlexShares&lt;font style="FONT-FAMILY: Times New Roman" size="4"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Morningstar Emerging Markets Factor Tilt Index Fund &lt;/font&gt;&lt;/p&gt;</rr:RiskReturnHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. Portfolio turnover may vary from year to year, as well as within a year. &lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:OtherExpensesNewFundBasedOnEstimates contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Other Expenses are estimated for the current fiscal year as the Fund had not commenced operations as of the date of this Prospectus.&lt;/i&gt;&lt;/font&gt;</rr:OtherExpensesNewFundBasedOnEstimates>
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  <rr:ExpenseNarrativeTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You will also incur usual and customary brokerage commissions when buying or selling shares of the Fund in the secondary market, which are not reflected in the example that follows: &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" size="2"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" size="2"&gt;Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same (taking into account the expense reimbursement arrangement for one year). Although your actual costs may be higher or lower, based on these assumptions your costs would be:&lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
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  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="USD">66</rr:ExpenseExampleYear01>
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  <rr:ObjectiveHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" color="#b04e19" size="3"&gt;&lt;b&gt;Investment Objective &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:ExpenseHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" color="#b04e19" size="3"&gt;&lt;b&gt;Fees and Expenses of the Fund &lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Portfolio Turnover.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" color="#b04e19" size="3"&gt;&lt;b&gt;Principal Investment Strategies &lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Underlying Index reflects the performance of a selection of equity securities designed to provide broad exposure to the global emerging equities markets, with increased exposure (or a &amp;#8220;tilt&amp;#8221;) to small-capitalization stocks and value stocks. Small-capitalization and value stocks in the Underlying Index are weighted slightly more than such stocks would be in an index that is solely market-capitalization weighted, all as determined by Morningstar, Inc. (the &amp;#8220;Index Provider&amp;#8221;) pursuant to its index methodology. In addition to tracking the performance of the Underlying Index, the Investment Adviser seeks to minimize portfolio turnover and tax inefficiencies. As of September 21, 2012, the Underlying Index comprised 1,975 stocks with market capitalizations ranging from $82.78 million to $221.96 billion. As of the same date, the Underlying Index&amp;#8217;s three largest constituents (by weighting) were Samsung Electronics, Taiwan Semiconductor Manufacturing and China Mobile Ltd., and its three largest industries were Financials, Information Technology and Materials. As of September 21, 2012, the top five countries (by weighting) represented in the Underlying Index were China, South Korea, Taiwan, Brazil and South Africa and in the aggregate represented 65.74% of the Underlying Index. The Underlying Index is governed by published, objective rules for security selection, exclusion, rebalancing and adjustments for corporate actions and is reconstituted on a semi-annual basis and is rebalanced quarterly. The Index Provider&amp;#8217;s index methodology and other factors will cause the composition of the Underlying Index to change over time. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;NTI uses a &amp;#8220;passive&amp;#8221; or indexing approach to try to achieve the Fund&amp;#8217;s investment objective. Unlike many investment companies, the Fund does not try to &amp;#8220;beat&amp;#8221; the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued. NTI uses a representative sampling strategy to manage the Fund. &amp;#8220;Representative sampling&amp;#8221; is investing in a representative sample of securities that collectively has an investment profile similar to the Underlying Index. Securities selected are expected to have, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of the Underlying Index. The Fund may or may not hold all of the securities that are included in the Underlying Index. Funds that employ a representative sampling strategy may incur tracking error risk to a greater extent than a fund that seeks to replicate an index. &amp;#8220;Replication&amp;#8221; is an indexing strategy in which a fund invests in substantially all of the securities in its underlying index in approximately the same proportions as in the underlying index. The Fund reserves the right to use a replication indexing strategy if NTI determines that it is in the best interests of the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund generally will invest under normal circumstances at least 80% of its total assets in the securities of the Underlying Index and in American Depositary Receipts (&amp;#8220;ADRs&amp;#8221;) and Global Depositary Receipts (&amp;#8220;GDRs&amp;#8221;) (collectively &amp;#8220;Depositary Receipts&amp;#8221;) based on the securities in the Underlying Index. The Fund may also invest up to 20% of its assets in cash and cash equivalents, including shares of money market funds advised by NTI or its affiliates, futures contracts, options on futures contracts, forward currency contracts, options and swaps, as well as securities not included in the Underlying Index, but which NTI believes will help the Fund track its Underlying Index. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Underlying Index is sponsored by the Index Provider, an organization that is independent of the Fund and NTI. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index. Additional information regarding the Index Provider is provided in the &amp;#8220;More Information about Underlying Index and Index Provider&amp;#8221; section of the Prospectus. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund is &amp;#8220;non-diversified&amp;#8221; under the Investment Company Act of 1940, as amended, and may invest more of its assets in fewer issuers than &amp;#8220;diversified&amp;#8221; funds. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Industry Concentration Policy&lt;/b&gt;. The Fund will concentrate its investments (&lt;i&gt;i.e.&lt;/i&gt;, hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. &lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;As with any investment, you could lose all or part of your investment in the Fund, and the Fund&amp;#8217;s performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund&amp;#8217;s net asset value (&amp;#8220;NAV&amp;#8221;), trading price, yield, total return and ability to meet its investment objective.&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Commodity Exposure Risk &lt;/b&gt; is the risk of investing in economies that are susceptible to fluctuations in certain commodity markets. Any negative changes in commodity markets could have an adverse impact on those economies. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Counterparty Risk &lt;/b&gt; is the risk that a counterparty to a financial investment instrument may default on its payment obligation to the Fund. Such a default may cause the value of an investment in the Fund to decrease. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Currency Risk &lt;/b&gt; is the risk that foreign currencies will fluctuate in value relative to the U.S. dollar, adversely affecting the value of the Fund&amp;#8217;s investments and its returns. Because the Fund&amp;#8217;s NAV is determined on the basis of U.S. dollars, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the market value of the Fund&amp;#8217;s holdings appreciates. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Derivatives Risk &lt;/b&gt; is the risk of investing in derivative instruments, including liquidity, interest rate, market, credit, counterparty and management risks, as well as the risk of mispricing or improper valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Emerging Markets Risk &lt;/b&gt; is the risk that markets of emerging market countries are less developed and less liquid, subject to greater price volatility and generally subject to increased economic, political, regulatory and other uncertainties than more developed markets. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Equity Securities Risk &lt;/b&gt; is the risk that the values of the equity securities owned by the Fund may be more volatile than other asset classes. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Foreign Securities Risk &lt;/b&gt; is the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in U.S. securities, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund&amp;#8217;s investments to decline. To the extent that the Fund&amp;#8217;s assets are concentrated in a single country or geographic region, the Fund will be subject to the risks associated with that particular country or region. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Industry Concentration Risk &lt;/b&gt; is the risk that, to the extent the Fund&amp;#8217;s investments are concentrated in the securities of issuers in a particular industry or group of industries, the Fund may be subject to increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting that industry or group of industries. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Issuer Risk &lt;/b&gt; is the risk that changes in the financial condition of an issuer or counterparty, changes in specific economic or political conditions that affect a particular type of security or issuer, and changes in general economic or political conditions can affect a security&amp;#8217;s or instrument&amp;#8217;s credit quality or value. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Management Risk&lt;/b&gt; is the risk that the representative sampling strategy used by NTI may fail to produce the intended results. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Market Risk&lt;/b&gt; is the risk that the Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Market Trading Risks &lt;/b&gt; are the risks that the Fund faces because its shares are listed on a securities exchange, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, and disruption in the creation/redemption process of the Fund. ANY OF THESE FACTORS MAY LEAD TO THE FUND&amp;#8217;S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Mid Cap Stock Risk &lt;/b&gt; is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;New Fund Risks&lt;/b&gt; are the risks that the Fund faces because it is a new fund. As a new fund, there can be no assurance that it will grow to or maintain an economically viable size, in which case it may experience greater tracking error to its Underlying Index than it otherwise would at higher asset levels, or it could ultimately liquidate. The Fund&amp;#8217;s Distributor does not maintain a secondary market in the shares. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Non-Diversification Risk &lt;/b&gt; is the risk that Fund performance may depend on the performance of a small number of issuers because the Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Passive Investment Risk &lt;/b&gt; is the risk that the Fund is not actively managed and NTI does not attempt to take defensive positions in any market conditions, including declining markets. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Small Cap Stock Risk &lt;/b&gt; is the risk that stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Small companies may have limited product lines or financial resources, or may be dependent upon a small or inexperienced management group, and their securities may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally the smaller the company size, the greater the risk. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Tracking Error Risk &lt;/b&gt; is the risk that the Fund&amp;#8217;s performance may vary substantially from the performance of the Underlying Index. The Fund employs a representative sampling strategy, and may incur tracking error risk to a greater extent than a fund that seeks to replicate an index. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Value Investing Risk &lt;/b&gt; is the risk that the Fund&amp;#8217;s investment in companies whose securities are believed to be undervalued, relative to their underlying profitability, will not appreciate in value as anticipated. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;It is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:RiskLoseMoney contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;It is possible to lose money on an investment in the Fund. &lt;/b&gt;&lt;/font&gt;</rr:RiskLoseMoney>
  <rr:RiskNondiversifiedStatus contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Non-Diversification Risk &lt;/b&gt; is the risk that Fund performance may depend on the performance of a small number of issuers because the Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. &lt;/font&gt;</rr:RiskNondiversifiedStatus>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;September 21, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="pure">0.0067</rr:ExpensesOverAssets>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="USD">212</rr:ExpenseExampleYear03>
  <dei:DocumentCreationDate contextRef="Duration_22Sep2011_21Sep2012">2012-09-24</dei:DocumentCreationDate>
  <rr:ExpenseExchangeTradedFundCommissions contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;You will also incur usual and customary brokerage commissions when buying or selling shares of the Fund in the secondary market, which are not reflected in the example that follows: &lt;/font&gt;</rr:ExpenseExchangeTradedFundCommissions>
  <rr:MaximumAccountFee decimals="INF" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="USD">0</rr:MaximumAccountFee>
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  <rr:ObjectivePrimaryTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the Morningstar&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Emerging Markets Factor Tilt Index&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;SM&lt;/sup&gt;&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; (the &amp;#8220;Underlying Index&amp;#8221;). &lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:RiskHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" color="#b04e19" size="3"&gt;&lt;b&gt;Principal Risks &lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: arial" color="#b04e19" size="3"&gt;&lt;b&gt;Fund Performance &lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;As of the date of this Prospectus, the Fund has not yet commenced investment operations. &lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceOneYearOrLess contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;As of the date of this Prospectus, the Fund has not yet commenced investment operations. &lt;/font&gt;</rr:PerformanceOneYearOrLess>
  <rr:StrategyPortfolioConcentration contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Industry Concentration Policy&lt;/b&gt;. The Fund will concentrate its investments (&lt;i&gt;i.e.&lt;/i&gt;, hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. &lt;/font&gt;</rr:StrategyPortfolioConcentration>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="pure">0.0065</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_3" decimals="4" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="pure">0.0002</rr:OtherExpensesOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_22Sep2011_21Sep2012S000033314_MemberC000102370_Member" unitRef="pure">0.0065</rr:NetExpensesOverAssets>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_22Sep2011_21Sep2012S000033314_Member">&lt;div style="display:none"&gt;~ http://www.flexshares.com/role/ScheduleExpenseExampleFlexSharesMorningstarEmergingMarketsFactorTiltIndexFund column period compact * ~&lt;/div&gt;

</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:ProspectusDate contextRef="Duration_22Sep2011_21Sep2012">2012-09-21</rr:ProspectusDate>
  <dei:DocumentEffectiveDate contextRef="Duration_22Sep2011_21Sep2012">2012-09-24</dei:DocumentEffectiveDate>
  <link:footnoteLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <link:loc xlink:type="locator" xlink:href="#Item_3" xlink:label="OtherExpensesOverAssets" />
    <link:footnote xlink:type="resource" xlink:label="footnote_OtherExpensesOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_OtherExpensesOverAssets">Under the Fund's Investment Advisory Agreement, Northern Trust Investments, Inc. ("NTI" or "Investment Adviser") is responsible for most of the operating expenses of the Fund. However, the Investment Adviser is not responsible for the following expenses: interest expenses, brokerage commissions and other trading expenses, fees and expenses of the independent trustees and their independent legal counsel, taxes and other extraordinary costs such as litigation and other expenses not incurred in the ordinary course of business. Other Expenses are estimated for the current fiscal year as the Fund had not commenced operations as of the date of this Prospectus.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="OtherExpensesOverAssets" xlink:to="footnote_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="#Item_2" xlink:label="FeeWaiverOrReimbursementOverAssets" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets">NTI has contractually agreed to reimburse the fees and expenses of the Trust's independent trustees and their independent legal counsel until September 21, 2013. The Fund's Board of Trustees may terminate the contractual arrangement at any time if it determines that it is in the best interest of the Fund and its shareholders.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets" />
  </link:footnoteLink>
</xbrl>
