This final rule completes the process of combining and conforming the regulations for tenant-based rental assistance under the Section 8 certificate and voucher programs, by adding two subparts that had been reserved in the previous final rule establishing the single part governing tenant-based assistance. This rule also amends requirements for project-based assistance under the certificate program. In addition, this rule continues the Department's regulation streamlining efforts by revising various sections in the part previously created to cover the combined Section 8 certificate and voucher programs and by consolidating definitions now found in individual program regulations into the part that covers definitions that have broader applicability.