Use a diagram with variable-value pairs for each call of a recursive function to help students see the change of control flow as calls are made and completed.

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  • It can be helpful to draw an arrow from one diagram to the next to indicate where a function call was made and that control is being passed. After the call has completed, the arrow can be erased to indicate a return of control.
  • This method can also be applied when teaching Assembly -- have the diagrams represent the different phases of the stack.

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