DEADLY QUARTET

1. these processes are four in number. They are designed as classes of processes to handle these four points:
   1. help factor,
   2. control factor,
   3. pc communication factor,
   4. interest factor.
   Unless these four points are present in a session, it is improbable, in a great number of cases that any real, lasting gain will be made. (HCOB 21 Apr 60)

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Technical Dictionary