In September 2007 the FASB issued SFAS No. 157, “Fair Value Measurement” (see FASB ASC 820). This statement specifies how fair value is to be determined when such measurement are required by existing GAAP. It does not indicate when fair value measurements are to be used. The rationale for SFAS No.157 was that pervious GAAP contained inconsistent definitions and only limited application guidance for fair value measurements. The most important aspects of SFAS No.157 are as follows: