MO or SD? Abolishing operations decreases the value of a reinforcer, therefore, decreases the behavior. Give a child lots of attention during a shift and make sure fun things in room when the toy bag is put away.
Applied Behavior Analysis: ABA info to help your child with autism - ABA Quizzes - Verbal Operant Quiz - Stimulus Prompts and Response Prompts Quiz - Good study material for the BCBA exam. A lot of great ABA info diagrams here as well.