Collaborative & Proactive Solutions is an evidence-based model of psychosocial treatment originated and developed by Dr. Ross Greene.  The intervention helps young people  (4 y.o. to 14 y.o.) with challenging behaviors and their caregivers learn how to solve the problems that are causing the behaviors. The problem solving is collaborative (not unilateral) and proactive (not reactive). It  is made up of four modules that teach caregivers : (a) to identify lagging skills and unsolved problems that contribute to oppositional episodes; (b) to prioritize which unsolved problems to focus on first; (c) to select 1 of 3  potential responses to solving problems: Plan A (solving a problem unilaterally, by imposing the adult will), Plan B (solving a problem collaboratively and proactively), and Plan C (setting aside the problem for now).