Six out of eight segments carry goodwill, of which Industrial Holdings and Private Banks & GAM (at 31 December 2004 only) each have less than 5% of the total balance. Business Banking Switzerland and Corporate Functions carry no goodwill. For the purpose of testing goodwill for impairment, UBS determines the recoverable amount of its segments on the basis of value in use. The recoverable amount is determined using a proprietary model based on the discounted cash flow method, which has been adapted to give effect to the special features of the banking business and its regulatory environment. The recoverable amount is determined by estimating streams of earnings available to shareholders in the next four quarters based on a rolling forecast process, discounted to their presented values. The terminal value reflecting the second and subsequent years is calculated using the first-year profit multiplied by the individual price-earnings multiple per segment, and discounted to present value. The recoverable amount of the segments is the sum of earnings available to shareholders in the first year and the terminal value.

The model is most sensitive to changes in the estimated earnings available to shareholders in year one and to the price-earnings multiple. Earnings available to shareholders are estimated based on forecast results, business initiatives and planned capital investments and returns to shareholders. Price-earnings multiples are determined internally, taking into account the forecast return on equity, the cost of equity and the long-term growth rate. Applied values are also validated against UBS's most recent share price development to ensure that the applied values are reasonably in line with market development. Discount rates applied range from 8.5% for Wealth Management International & Switzerland and Wealth Management US to 10.5% for Investment Bank.

Management believes that reasonable changes in key assumptions used to determine the recoverable amounts of segments will not result in an impairment situation.

The following table presents the disclosure of goodwill and other intangible assets by business segment for the year ended 31 December 2005.

For further information about disclosure by Business Group, including the amortization of goodwill and other intangible Due to the issuance of IFRS 3 Business Combinations, goodwill amortization ceased from 1 January 2005. In addition, certain intangible assets were reclassified to Goodwill at 1 January 2005 and have been excluded for the purpose of calculating estimated (aggregated) amortization expenses for Other intangible assets. See Note 1aa) for further details.

The estimated, aggregated amortization expenses for other intangible assets are as follows:

Due to the issuance of IFRS 3 Business Combinations, goodwill amortization ceased from 1January 2005. In addition, certain intangible assets were reclassified to Goodwill at 1 January 2005 and have been excluded for the purpose of calculating estimated (aggregated) amortization expenses for Other intangible assets. See Note 1aa) for further details.