A key element in evaluation and performance measurement, is the subject of this volume.The feature is the discussion of current issues in performance testing, including those related to legal challenges and test validity. The evaluator,s role in performance measurement is discussed, as is the suitability of existing performance measures. Where no appropriate test exists, the authors give step-by-step instructions on how to construct a scientifically reliable and valid one. The analysis and reporting of data gained from performance testing are also described. Current issues in performance testing are disclosed, including those related to legal challenges and test validity. Examples are drawn from a wide range of fields, including education, business, and social services.