A contingency board is a visual support that shows the consequences of appropriate and inappropriate choices. All symbols are removable, so it can be fully customized for each child. An adult would select the symbols for the board and go over the options with the child, similarly to a social story.
E.g., for the board show here, an adult might say, "I can see that you are frustrated. We can make a good choice or a bad choice. If we make a good choice and take deep breaths and count to 10, we can play on the iPad for a few minutes. If we make a bad choice and flop down or hit, then there's no iPad."