Underlying market conditions are far from stable; continued downtrends in home prices often require appraisers to apply appropriate market trend adjustments to recent comparable transactions. Moreover, in many distressed markets, it is also likely that some or all available recent transactions are distressed sales. Since the parties to distressed properties are often unique, and distressed properties are typically sold at a significant price discount, which may or may not represent underlying market trends, appraisers are challenged with deciding whether such distressed sales are relevant market data for non-distressed transactions or whether adjustments are needed to better extract relevant market information.