feelings in a family member; the opposite of differentiation . Fusion also refers to a relationship where one person lives through another person, denying the meaning of his own separate existence by merging with the other. In systems theory , Fusion refers to a confusion of emotion and thought.
operations research whose principle aim is to facilitate long-range planning based on 1. forecasting from the past supported by mathematical models ; 2. Cross-disciplinary treatment of its subject matter; 3. systematic use of expert judgment, and; 4. a systems-analytical approach to its problems.