Alexander is a child with Down Syndrome who is being taught to solve puzzles. Every time he solves a puzzle, he is given a poker chip. When he collects 10 poker chips, they can be traded in for a snack. Alexander's teacher is using something similar to

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Alexander's teacher is using a token economy, which is a reinforcement system where tokens or points are given as rewards for desired behavior. These tokens can be exchanged for a desired item or activity. In this case, Alexander is earning poker chips for solving puzzles, and once he has collected enough, he can exchange them for a snack. This system encourages and reinforces positive behavior.

Alexander Is a Child with Down Syndrome Who Is Being