to closely monitor this asset.

Goodwill

As a result of our goodwill impairment review work, described in detail below, none of our goodwill is impaired as of December 31, 2010, and we do not believe the risk of impairment is significant at this time.

Accounting Policy and Specific Procedures

Annually and whenever impairment indicators are present, we calculate the fair value of each reporting unit and compare the fair value to its book value. If the carrying amount is found to be greater, we then determine the implied fair value of goodwill by subtracting the fair value of all the identifiable net assets other than goodwill from the fair value of the reporting unit and record an impairment loss for the excess, if any, of book value of goodwill over the implied fair value.

In determining the fair value of a reporting unit, as appropriate for the individual reporting unit, we may use the market approach, the income approach or a weighted-average combination of both approaches.

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The market approach is a historical approach to estimating fair value and relies primarily on external information. Within the market approach are two methods that we may use:

O Guideline public company method—this method employs market multiples derived from market prices of stocks of companies that are engaged in the same or similar lines of business and that are actively traded on a free and open market and the application of the identified multiples to the corresponding measure of our reporting unit’s financial performance.

O Guideline transaction method—this method relies on pricing multiples derived from transactions of significant interests in companies engaged in the same or similar lines of business and the application of the identified multiples to the corresponding measure of our reporting unit’s financial performance.

The market approach is only appropriate when the available external information is robust and deemed to be a reliable proxy for the specific reporting unit being valued; however, these assessments may prove to be incomplete or inaccurate. Some of the more significant estimates and assumptions inherent in this approach include: the selection of appropriate guideline companies and transactions and the determination of applicable premiums and discounts based on any differences in ownership percentages, ownership rights, business ownership forms or marketability between the reporting unit and the guideline companies and transactions.

The income approach is a forward-looking approach to estimating fair value and relies primarily on internal forecasts. Within the income approach, the method that we use is the discounted cash flow method. We start with a forecast of all the expected net cash flows associated with the reporting unit, which includes the application of a terminal value, and then we apply a reporting unit-specific discount rate to arrive at a net present value amount. Some of the more significant estimates and assumptions inherent in this approach include: the amount and timing of the projected net cash flows, which includes the expected impact of technological risk and competitive, legal and/or regulatory forces on the