Documentation describing all of the necessary functional and physical characteristics of the Configuration Item (CI), the selected functional and physical characteristics designated for production acceptance testing, and tests necessary for deployment/installation, operation, support, training, and disposal of the CI. The initial product baseline is usually established and put under configuration control at each CI's Critical Design Review (CDR), culminating in an initial product baseline at the system-level CDR. The system product baseline is finalized and validated at the Physical Configuration Audit (PCA).