Two key assumptions of the approach to therapy are that psychological disorders are learned in exactly the same way as normal behaviors are and that they can be treated by applying the basic principles of learning.

Two key assumptions of the behavioral approach. This approach takes the position that psychological disorders come as a result of our environment. This is as opposed to the biological approach, in which it is believed that psychological disorders are a part of a human being's brain chemistry and are essentially biologically 'given' to human beings.

3. i would say one, but one is not prime nor composite.