This volume emphasizes the conceptualization and use of measurement concepts and principles in relationship to decisions routinely made in various phases of direct practice - assessment, planning interventions, implementing intervention, and termination and follow-up. The authors describe measurement concepts and research tools providing frequent case examples to demonstrate how measurement can facilitate case planning and decision making. More specifically, they show how practitioners can utilize measurement techniques to help determine client eligibility, to assess client functioning and problems, to determine intervention plans and goals and maintain the extent to which they are implemented, and to estimate the degree of client progress and the extent to which that progress is maintained.