The book governs the American psychological Association (APA), five general principles:

Principle A: Beneficence and Nonmaleficence

Principle B: Fidelity and Responsibility

Principle C: Integrity

Principle D: Justice

Principle E: Respect for people Rights and Dignity

The book also addresses the Assessment Process, and the historical influences of understanding human behavior. The book further describes the evolution of Health Psychology & Case Studies on Psychotherapy.