and the competitive trends impacting the asset, including consideration of any technical, legal, regulatory, or economic barriers to entry as well as expected changes in standards of practice for indications addressed by the asset.

The implied fair value of goodwill is determined by first estimating the fair value of the associated business segment. To estimate the fair value of each business segment, we generally use the “market approach,” where we compare the segment to similar businesses or “guideline” companies whose securities are actively traded in public markets or which have recently been sold in a private transaction. We may also use the “income approach,” where we use a discounted cash flow model in which cash flows anticipated over several periods, plus a terminal value at the end of that time horizon, are discounted to their present value using an appropriate rate of return. Some of the more significant estimates and assumptions inherent in the goodwill impairment estimation process using the “market approach” include: the selection of appropriate guideline companies; the determination of market value multiples for the guideline companies and the subsequent selection of an appropriate market value multiple for the business segment based on a comparison of the business segment to the guideline companies; and the determination of applicable premiums and discounts based on any differences in ownership percentages, ownership rights, business ownership forms, or marketability between the segment and the guideline companies; and/or knowledge of the terms and conditions of comparable transactions. When considering the “income approach,” we include: the required rate of return used in the discounted cash flow method, which reflects capital market conditions and the specific risks associated with the business segment. Other estimates inherent in the “income approach” include long-term growth rates and cash flow forecasts for the business segment.

A single estimate of fair value results from a complex series of judgments about future events and uncertainties and relies heavily on estimates and assumptions (see “Estimates and Assumptions” above). The judgments made in determining an estimate of fair value can materially impact our results of operations. As such, for significant items, we often obtain assistance from third-party valuation specialists. The valuations are based on information available as of the impairment review date and are based on expectations and assumptions that have been deemed reasonable by management.

Pension and Postretirement Benefit Plans and Defined Contribution Plans

We provide defined benefit pension plans and defined contribution plans for the majority of our employees worldwide. In the U.S., we have both qualified and supplemental (non- qualified) defined benefit plans and defined contribution plans, as well as other postretirement benefit plans, consisting primarily of healthcare and life insurance for retirees.

A U.S. qualified plan meets the requirements of certain sections of the Internal Revenue Code and, generally, contributions to qualified plans are tax-deductible. It typically provides benefits