We use the Listing of Impairments (the listings) at the third step of the sequential evaluation process when we evaluate your claim for benefits based on disability under title II and title XVI of the Social Security Act (the Act). This final rule extends until July 3, 2006, the date on which listings for four body systems will no longer be effective and extends until July 2, 2007, the date on which the listings for eight body systems will no longer be effective. Other than extending the date during which the listings will be effective, we have made no revisions to the listings; they remain the same as they now appear in the Code of Federal Regulations. This extension will ensure that we continue to have the medical evaluation criteria in the listings to adjudicate disability claims in these body systems at step three of the sequential evaluation process.