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The fair values of pension plan assets at December 31, 2011 and 2010 by asset category are as follows: 

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(a) Represents commingled funds that invest primarily in common stocks. 

(b) Represents enhanced equity separate account and commingled fund portfolios. A portion of the portfolio may include long-short market neutral and relative value strategies that invest in publicly traded, equity and fixed income securities, as well as derivatives of equity and fixed income securities and foreign currency. 

(c) Represents limited partner investments with general partners that primarily invest in debt and equity. 

(d) Represents mortgage and asset-backed securities. 

(e) Represents investments in real estate including commingled funds and directly held properties. 

(f) Represents insurance contracts and global balanced risk commingled funds consisting mainly of equity, bonds and some commodities. 

(g) Represents short-term commercial paper, bonds and other cash or cash-like instruments. 

(h) Represents trust receivables and payables that are not leveled. 

Derivatives in the plan are primarily used to manage risk and gain asset class exposure while still maintaining liquidity. 

Derivative instruments mainly consist of equity futures, interest rate futures, interest rate swaps and currency forward contracts. 

Our common stock represents approximately 4% and 3% of total plan assets at December 31, 2011 and 2010, respectively. 

We review our assets at least quarterly to ensure we are within the targeted asset allocation ranges and, if necessary, asset balances are adjusted back within target allocations. 

We employ a broadly diversified investment manager structure that includes diversification by active and passive management, style, capitalization, country, sector, industry and number of investment managers. 

