This excerpt taken from the ASCMA 10-K filed Mar 31, 2009.
In accordance with SFAS No. 144, management reviews the realizability of its long-lived assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. In evaluating the value and future benefits of long-term assets, their carrying value is compared to managements best estimate of undiscounted future cash flows over the remaining economic life. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying value of the assets exceeds the estimated fair value of the assets.