The following are other web sites that might contain additional information of interest to you. They sometimes contain items related to performance management, such as bills, reports, or case law summaries.
Code of Federal Regulations (National Archives site)
The Congressional Institute on the Results Act
Congressional Legislation (Thomas)
Council for Excellence in Government
Federal Labor Relations Authority
Government Accounting Office
International Personnel Managers Association
Merit Systems Protection Board
The National Partnership for Reinventing Government
United States Code
Related Sites at OPM:
Resource Center for Addressing and Resolving Poor Performance
Support for Performance Based Organizations
Center for Partnership and Labor-Management Relations
Central Personnel Data File (CPDF) Reporting Requirements
Guide to Personnel Recordkeeping
Guide to Processing Personnel Actions
Demonstration Projects Fact Sheets