This chapter outlines the procedures for processing and conducting investigations of complaints alleging discrimination in employment by federal contractors. Preparing for and investigating a complaint differs from conducting a compliance evaluation. The difference is that this investigation is primarily focused on the specific allegations in the complaint. This chapter includes the general principles of complaint processing and investigation planning. It, therefore, focuses on the CO’s responsibilities related to investigating and resolving complaints. It describes the CO’s responsibility to evaluate the allegations in a complaint to determine the legal and analytical framework for addressing each allegation, to identify data and information to obtain during an investigation, to conduct appropriate analyses, and to develop and provide notification of findings. The chapter also discusses conciliation efforts and enforcement actions.