The personality theory of Abraham Maslow has variously been called humanistic theory, transpersonal theory, the third force in psychology, the fourth force in personality, needs theory, and self-actualization theory.
holistic-dynamic theory assumes that the whole person is constantly being motivated by one need or another and that people have the potential to grow toward psychological health, that is, self-actualization.
To attain self-actualization, people must satisfy lower level needs such as hunger, safety, love, and esteem.
Third Force - Somewhat vague term referring to those approaches to psychology that have reacted against the older psychodynamic and behavioristic theories. This is usually thought to include humanistic, existential, and phenomenological theories.
The first force was psychoanalysis and its modifications
the second force was behaviorism and its various forms.
his graduate-level research with primates was greatly influenced by the work of John B. Watson