This book uses psychological type as a model for organizing mental health interventions, including assessing how a client’s personality is affected within a specific relationship using the Psychological Type Relationship Inventory and the Psychological Type Relationship Scale. By examining each psychological type characteristic, the book demonstrates how to help a client overcome a psychological type challenge by using techniques drawn from cognitive-behavioral, humanistic, and family therapy approaches. Over 20 techniques are described in explicit how-to format and chapters show the reader how to assess both positive personality characteristics as well as negative or challenging personality characteristics in developing therapy plans. The interdisciplinary nature of the text benefits a wide spectrum of mental health practitioners who are interested in incorporating personality into their case conceptualizations to develop more effective interventions in relationship therapy.