Objective:

and as a secondary objective, capital appreciation.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q3 '09	9.86	%
Lowest return for a quarter during the period of the bar chart above:	Q4 '08	-11.26	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Barclays U.S. Aggregate Bond Index to the S&P Target Date Retirement Income Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime Strategic Income Blended Index were 75.00% Barclays U.S. Aggregate Bond Index, 19.45% Russell 3000^® Index, and 5.55% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2010 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	14.17	%
Lowest return for a quarter during the period of the bar chart above:	Q4 '08	-16.27	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Barclays U.S. Aggregate Bond Index to the S&P Target Date 2010 Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2010 Blended Index were 57.50% Barclays U.S. Aggregate Bond Index, 31.35% Russell 3000^® Index, and 11.15% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2015 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q3 '09	14.34	%
Lowest return for a quarter during the period of the bar chart above:	Q3 '11	-10.77	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Barclays U.S. Aggregate Bond Index to the S&P Target Date 2015 Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2015 Blended Index were 48.75% Barclays U.S. Aggregate Bond Index, 37.55% Russell 3000^® Index, and 13.70% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2020 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	16.10	%
Lowest return for a quarter during the period of the bar chart above:	Q4 '08	-18.35	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2020 Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2020 Blended Index were 45.95% Russell 3000^® Index, 37.25% Barclays U.S. Aggregate Bond Index, and 16.80% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2025 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	15.65	%
Lowest return for a quarter during the period of the bar chart above:	Q3 '11	-13.65	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2025 Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2025 Blended Index were 51.15% Russell 3000^® Index, 30.30% Barclays U.S. Aggregate Bond Index, and 18.55% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2030 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	17.01	%
Lowest return for a quarter during the period of the bar chart above:	Q4 '08	-19.94	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2030 Index because the S&P Target Date Indexes are more widely used and recognized in the industry.

Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2030 Blended Index were 55.80% Russell 3000^® Index, 23.75% Barclays U.S. Aggregate Bond Index, and 20.45% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2035 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	16.61	%
Lowest return for a quarter during the period of the bar chart above:	Q3 '11	-15.22	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2035 Index because the S&P Target Date Indexes are more widely used and recognized in the industry.

Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2035 Blended Index were 59.25% Russell 3000^® Index, 22.40% MSCI EAFE Index NDTR D, and 18.35% Barclays U.S. Aggregate Bond Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2040 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	17.41	%
Lowest return for a quarter during the period of the bar chart above:	Q4 '08	-21.32	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2040 Index because the S&P Target Date Indexes are more widely used and recognized in the industry.

Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2040 Blended Index were 62.45% Russell 3000^® Index, 24.35% MSCI EAFE Index NDTR D, and 13.20% Barclays U.S. Aggregate Bond Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2045 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	17.31	%
Lowest return for a quarter during the period of the bar chart above:	Q3 '11	-16.15	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2045 Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2045 Blended Index were 64.15% Russell 3000^® Index, 25.95% MSCI EAFE Index NDTR D, and 9.90% Barclays U.S. Aggregate Bond Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2050 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	17.82	%
Lowest return for a quarter during the period of the bar chart above:	Q4 '08	-21.98	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2050 Index because the S&P Target Date Indexes are more widely used and recognized in the industry.

Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2050 Blended Index were 65.85% Russell 3000^® Index, 27.10% MSCI EAFE Index NDTR D, and 7.05% Barclays U.S. Aggregate Bond Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2055 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Total Returns as of December 31 each year (Institutional Class shares)



Highest return for a quarter during the period of the bar chart above:	Q2 '09	17.40	%
Lowest return for a quarter during the period of the bar chart above:	Q3 '11	-17.02	%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.

Effective March 1, 2014, the Account's primary benchmark will change from Russell 3000^® Index to the S&P Target Date 2055 Index because the S&P Target Date Indexes are more widely used and recognized in the industry.

Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime 2055 Blended Index were 66.10% Russell 3000^® Index, 27.40% MSCI EAFE Index NDTR D, and 6.50% Barclays U.S. Aggregate Bond Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

PRINCIPAL LIFETIME 2060 FUND

The Fund seeks a total return consisting of long-term growth of capital and current income.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)

Example

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’s operating expenses remain the same. If separate account expenses and contract level expenses were included, expenses would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

Principal Investment Strategies

Principal Risks

Performance

Objective:

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses - Institutional, R-1, R-2, R-3, R-4, and R-5 Share Classes PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] Strategic Asset Management Flexible Income Portfolio [Member]	SAM Flexible Income Fund, Institutional Class [Member]	SAM Flexible Income Fund, Class R-1 [Member]	SAM Flexible Income Fund, Class R-2 [Member]	SAM Flexible Income Fund, Class R-3 [Member]	SAM Flexible Income Fund, Class R-4 [Member]	SAM Flexible Income Fund, Class R-5 [Member]
Management Fees (as a percentage of Assets)	0.32%	0.32%	0.32%	0.32%	0.32%	0.32%
Distribution and Service (12b-1) Fees		0.35%	0.30%	0.25%	0.10%
Other Expenses (as a percentage of Assets):	0.02%	0.53%	0.45%	0.32%	0.28%	0.26%
Acquired Fund Fees and Expenses	0.58%	0.58%	0.58%	0.58%	0.58%	0.58%
Net Expenses (as a percentage of Assets)	0.92%	1.78%	1.65%	1.47%	1.28%	1.16%

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Expense Example - Institutional, R-1, R-2, R-3, R-4, and R-5 Share Classes PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] Strategic Asset Management Flexible Income Portfolio [Member] (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
SAM Flexible Income Fund, Institutional Class [Member]	94	293	509	1,131
SAM Flexible Income Fund, Class R-1 [Member]	181	560	964	2,095
SAM Flexible Income Fund, Class R-2 [Member]	168	520	897	1,955
SAM Flexible Income Fund, Class R-3 [Member]	150	465	803	1,757
SAM Flexible Income Fund, Class R-4 [Member]	130	406	702	1,545
SAM Flexible Income Fund, Class R-5 [Member]	118	368	638	1,409

As a fund of funds, the Fund does not pay transaction costs, such as commissions, when it buys and sells shares of underlying funds (or “turns over” its portfolio). An underlying fund does pay transaction costs when it buys and sells portfolio securities, and a higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the examples, affect the performance of the underlying fund and the Fund. During its most recent fiscal year, the Fund's portfolio turnover rate was 10.5% of the average value of its portfolio.

The SAM Portfolios operate as funds of funds and invest principally in Institutional Class shares of Principal Funds, Inc. equity funds, fixed-income funds and specialty funds ("Underlying Funds"); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the Sub-Advisor in accordance with its outlook for the economy, the financial markets and the relative market valuations of the Underlying Funds.

The Portfolio:


•	Generally invests between 55% and 95% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund (fixed-income funds that generally invest in fixed income instruments such as high yield securities (or “junk” bonds), real estate securities, mortgage-backed securities, government and government-sponsored securities, and corporate bonds)


•	Generally invests between 5% and 45% of its assets in equity funds, and less than 30% in any one equity fund (equity funds that generally invest in domestic and foreign equity securities) and

•

Generally invests less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund (specialty funds that generally offer unique combinations of traditional equity securities and fixed-income securities or that use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, timber and private equity)

The Portfolio may temporarily exceed these percentage ranges for short periods, and the Sub-Advisor may alter the percentage ranges when it deems appropriate.

The broad diversification of the Portfolio is designed to cushion severe losses in any one investment sector and moderate overall price volatility. However, the Portfolio is subject to the particular risks of the Underlying Funds in which it invests, and its share prices and performance will fluctuate with the shares prices and performance of the Underlying Funds. The Portfolio operates as a fund of funds and thus bears both its own expenses and, indirectly, its proportionate share of the expenses of the underlying funds in which it invests. An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. If you sell your shares when their value is less than the price you paid, you will lose money.

The principal risks of investing in the Portfolio that are inherent in the fund of funds, in alphabetical order, are:

Asset Allocation Risk. A fund's selection and weighting of asset classes may cause it to underperform other funds with a similar investment objective.

Conflict of Interest Risk. The Advisor and its affiliates earn different fees from different underlying funds and may have an incentive to allocate more fund-of-fund assets to underlying funds from which they receive higher fees.

Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests.

The principal risks of investing in the Portfolio that are inherent in the underlying funds, in alphabetical order, are:

Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.

Equity Securities Risk. The value of equity securities could decline if the issuer's financial condition declines or in response to overall market and economic conditions. A fund's principal market segment(s), such as large cap, mid cap or small cap stocks, or growth or value stocks, may underperform other market segments or the equity markets as a whole. Investments in smaller companies and mid-size companies may involve greater risk and price volatility than investments in larger, more mature companies.

Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate risk and credit quality risk. The market value of fixed-income securities generally declines when interest rates rise, and an issuer of fixed-income securities could default on its payment obligations.

Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).

Growth Stock Risk. If growth companies do not increase their earnings at a rate expected by investors, the market price of the stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.

High Yield Securities Risk. High yield fixed-income securities (commonly referred to as "junk bonds") are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.

Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests.

Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund's average portfolio duration, the more sensitive the fund will be to changes in interest rates.

Prepayment Risk. Unscheduled prepayments on mortgage-backed and asset-backed securities may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).

Real Estate Securities Risk. Real estate securities are subject to the risks associated with direct ownership of real estate, including declines in value, adverse economic conditions, increases in expenses, regulatory changes and environmental problems. Investing in securities of companies in the real estate industry, subjects a fund to the special risks associated with the real estate market including factors such as loss to casualty or condemnation, changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents, and the management skill and creditworthiness of the issuer.

Risk of Being an Underlying Fund. A fund is subject to the risk of being an underlying fund to the extent that a fund of funds invests in the fund. An underlying fund of a fund of funds may experience relatively large redemptions or investments as the fund of funds periodically reallocates or rebalances its assets. These transactions may cause the underlying fund to sell portfolio securities to meet such redemptions, or to invest cash from such investments, at times it would not otherwise do so, and may as a result increase transaction costs and adversely affect underlying fund performance.

U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities.

U.S. Government Sponsored Securities Risk. Securities issued by U.S. government-sponsored or -chartered enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. Treasury.

Value Stock Risk. The market may not recognize the intrinsic value of value stocks for a long time, or they may be appropriately priced at the time of purchase.

The following information provides an indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information online at www.principal.com or by calling 1-800-222-5852.

The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows, for each share class of the Fund and for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare to the returns of one or more broad-based market indices.


•	The Portfolio commenced operations after succeeding to the operations of another fund on January 12, 2007.


•	Performance for periods prior to that date is based on the performance of the predecessor fund’s Class A shares adjusted to reflect the fees and expenses of these classes.


•	The adjustments result in performance (for periods prior to the date these classes began operations) that is no higher than the historical performance of Class A shares.


•	The predecessor fund commenced operations on July 25, 1996.

Average Annual Total Returns - Institutional, R-1, R-2, R-3, R-4, and R-5 Share Classes PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] Strategic Asset Management Flexible Income Portfolio [Member]	Label	1 Year	5 Years	10 Years
SAM Flexible Income Fund, Institutional Class [Member]	Institutional Class Return Before Taxes	7.43%	10.42%	5.67%
SAM Flexible Income Fund, Institutional Class [Member] After Taxes on Distributions	Institutional Class Return After Taxes on Distributions	5.80%	8.97%	4.22%
SAM Flexible Income Fund, Institutional Class [Member] After Taxes on Distributions and Sales	Institutional Class Return After Taxes on Distribution and Sale of Fund Shares	4.63%	7.78%	3.99%
SAM Flexible Income Fund, Class R-1 [Member]	Class R-1 Return Before Taxes	6.53%	9.47%	4.98%
SAM Flexible Income Fund, Class R-2 [Member]	Class R-2 Return Before Taxes	6.66%	9.63%	5.12%
SAM Flexible Income Fund, Class R-3 [Member]	Class R-3 Return Before Taxes	6.86%	9.83%	5.26%
SAM Flexible Income Fund, Class R-4 [Member]	Class R-4 Return Before Taxes	7.06%	10.03%	5.41%
SAM Flexible Income Fund, Class R-5 [Member]	Class R-5 Return Before Taxes	7.19%	10.17%	5.48%
Barclays Aggregate Bond Index [Member]	Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)	(2.02%)	4.44%	4.55%
Russell 3000 Index [Member]	Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)	33.55%	18.71%	7.88%
MSCI - EAFE NDTR D Index [Member]	MSCI EAFE Index NDTR D (reflects no deduction for fees, expenses, or taxes)	22.78%	12.44%	6.91%
SAM Flexible Income Blended Index [Member]	SAM Flexible Income Blended Index (reflects no deduction for fees, expenses, or taxes)	5.56%	7.86%	5.59%

Objective:

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses - Institutional, R-1, R-2, R-3, R-4, and R-5 Share Classes PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] Strategic Asset Management Conservative Balanced Portfolio [Member]	SAM Conservative Balanced Fund, Institutional Class [Member]	SAM Conservative Balanced Fund, Class R-1 [Member]	SAM Conservative Balanced Fund, Class R-2 [Member]	SAM Conservative Balanced Fund, Class R-3 [Member]	SAM Conservative Balanced Fund, Class R-4 [Member]	SAM Conservative Balanced Fund, Class R-5 [Member]
Management Fees (as a percentage of Assets)	0.32%	0.32%	0.32%	0.32%	0.32%	0.32%
Distribution and Service (12b-1) Fees		0.35%	0.30%	0.25%	0.10%
Other Expenses (as a percentage of Assets):	0.02%	0.53%	0.45%	0.32%	0.28%	0.26%
Acquired Fund Fees and Expenses	0.63%	0.63%	0.63%	0.63%	0.63%	0.63%
Net Expenses (as a percentage of Assets)	0.97%	1.83%	1.70%	1.52%	1.33%	1.21%

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Expense Example - Institutional, R-1, R-2, R-3, R-4, and R-5 Share Classes PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] Strategic Asset Management Conservative Balanced Portfolio [Member] (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
SAM Conservative Balanced Fund, Institutional Class [Member]	99	309	536	1,190
SAM Conservative Balanced Fund, Class R-1 [Member]	186	576	990	2,148
SAM Conservative Balanced Fund, Class R-2 [Member]	173	536	923	2,009
SAM Conservative Balanced Fund, Class R-3 [Member]	155	480	829	1,813
SAM Conservative Balanced Fund, Class R-4 [Member]	135	421	729	1,601
SAM Conservative Balanced Fund, Class R-5 [Member]	123	384	665	1,466

As a fund of funds, the Fund does not pay transaction costs, such as commissions, when it buys and sells shares of underlying funds (or “turns over” its portfolio). An underlying fund does pay transaction costs when it buys and sells portfolio securities, and a higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the examples, affect the performance of the underlying fund and the Fund. During its most recent fiscal year, the Fund's portfolio turnover rate was 13.1% of the average value of its portfolio.

The SAM Portfolios operate as funds of funds and invest principally in Institutional Class shares of Principal Funds, Inc. equity funds, fixed-income funds and specialty funds ("Underlying Funds"); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the Sub-Advisor in accordance with its outlook for the economy, the financial markets and the relative market valuations of the Underlying Funds.

The Portfolio:


•	Generally invests between 40% and 80% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund (fixed-income funds that generally invest in fixed income instruments such as high yield securities (or “junk” bonds), real estate securities, mortgage-backed securities, government and government-sponsored securities, and corporate bonds)


•	Generally invests between 20% and 60% of its assets in equity funds, and less than 30% in any one equity fund (equity funds that generally invest in domestic and foreign equity securities) and