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Write Psychotherapy Integration and the Systems of Psychotherapy. A natural outgrowth of understanding human nature. You understand how things “should” be and how a person has deviated, the next logical step is to come up with strategies to “fix” them.  Once you’ve defined how things ought to work, you can define how they go “wrong”. 

Reference
Okun, B. F. (1990). Seeking connections in psychotherapy. San Francisco, CA: Jossey-Bass.