Family Adaptability and Cohesion Evaluation Scale (FACES) IV was developed to tap the full continuum of the cohesion and flexibility dimensions from the Circumplex Model of Marital and Family Systems. Six scales were developed, with two balanced scales and four unbalanced scales designed to tap low and high cohesion (disengaged and enmeshed) and flexibility (rigid and chaotic). The six scales in FACES IV were found to be reliable and valid. High levels of concurrent, construct, and discriminant validity were found and new ratio scores measure the balanced and unbalanced level of cohesion and flexibility. A clinical example on the use of FACES IV scores to assess family dynamics, plan the treatment, and determine the impact of family therapy is provided. (Contains 5 tables and 3 figures.)