What are some of the areas of a client’s life that might help a counselor develop/identify patterns of mental illness in a case conceptualization? How does the client’s developmental stage help guide treatment and interventions?

text book reference:   

Schwitzer, A. M., & Rubin, L. C. (2014). Diagnosis and treatment planning skills: A popular culture approach (2nd ed.). Los Angeles, CA: Sage Publications. ISBN-13: 9781483349763