The fourth edition of this essential resource has dozens of new scales as well as updated information for existing instruments, expanding and cementing its utility for members of all the helping professions, including psychology, social work, psychiatry, counseling, nursing, and medicine. Each instrument is reproduced in its entirety and critiqued by the editors, who provide guidance on how to select and score them. This first volume covers measures for use with couples; its companion focuses on adults. Alone or as a set, these classic compendiums are powerful tools that clinicians and researchers alike will find an invaluable addition to - or update of - their libraries.