according to the www.apa.org:

"The circumplex model of emotions has been an extremely valuable paradigm for understanding personality, psychopathology, and interpersonal relations over the past 30 years. In this volume, Robert Plutchik extends his model to inform the practice of psychotherapy across all theoretical orientations and therapeutic modalities.
Beginning with a description of the role of emotions in symptom formation, Plutchik demonstrates how the circumplex model has relevance not only to emotions, but to personality traits, personality disorders, and ego defenses as well. He presents a unique compendium of therapist tactics for uncovering emotions and encouraging their expression. He examines the many distinctions between social conversation and therapeutic communication and describes specific strategies of intervention found to be helpful to therapeutic enterprise."