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.