Measuring attainment of the program's objectives and describing the program's implementation are listed as two of the evaluator's major responsibilities. The description should include an explanation of the context in which the program was initiated, as well as the component materials and activities. This booklet has three purposes: (1) suggesting program features and activities which may be included in a program implementation report; (2) helping to determine how much effort to spend on describing program implementation; and (3) suggesting instrument designs to produce backup date to assure descriptive accuracy. Chapter 2 provides an outline for the implementation section of an evaluation report. Chapters 3 through 6 describe measurement techniques, including records, observations, and self-reports. Chapter 7 discusses the validity and reliability of the measure. Most chapters end with short bibliographies. (MH)