An evaluation plan is a written document that describes how you will monitor and evaluate your program, as well as how you intend to use evaluation results for program improvement and decision making. The evaluation plan clarifies how you will describe the "What," the "How," and the "Why It Matters" for your program.
Because most people associate evaluation with measurement of program results, program planners often do not think about evaluation until after the program is up and running. Instead, evaluation should be planned from the beginning, as the program is being developed. Incorporating evaluation will sharpen everyone's thinking about the program: its mission, its goals, its objectives, and the activities designed to meet those objectives. Used in this way, evaluation planning can be a valuable management tool.