A performance management plan is a critical tool for planning, managing, and documenting data collection and data use. It contributes to the effectiveness of the performance monitoring system by assuring that comparable data will be collected on a regular and timely basis. These are essential to the operation of a credible and useful performance-based management approach. PMPs promote the collection of comparable data (baseline, targets, and progress) by sufficiently documenting indicator definitions, sources, and methods of data collection. This enables operating units to collect comparable data over time even when key personnel change.