A Key Performance Parameter (KPP) is defined by CD-2 and is a characteristic, function, requirement or design basis that if changed would have a major impact on the system or facility performance, schedule, cost and/or risk. Achieving the KPPs is a requirement for successful project completion (CD-4). In some cases, a minimum KPP or threshold value should be highlighted for CD-4 realizing in many instances full operational capabilities may take years to achieve. Objective KPPs are used to identify the ultimate performance capability, and in some cases these may also be met at CD-4. The minimum KPPs and facility mission must stay intact for the duration of the project since they represent a foundational element within the original Performance Baseline (PB).  KPPs are developed between the Project & Funding Program and continue to evolve through CD-2.