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Here is a Finding Nemo Token Board. There are many benefits in using a token economy with students with autism, developmental disabilities and behavioural challenges. Token boards are used by giving a "token" to reinforce positive behaviour. I think its important to explain to the student the "rules/requirements" (ex. work completion, safe hands & feet for a certain period of time, etc) of earning a token beforehand and offer them choice in what their "reward" (ex. iPad, play dough, bubbles, etc).
Let me know if you have any questions! Hope this works for your kiddo! :)