Ideation and Iteration
Once I understood where a problem or feature fit within the workflow, I would use the whiteboard to ideate or iterate on the solution. For ideation, I used arrows to show the interaction between multiple screens. I iterated by drawing dozens of variations of the same screen or element.
I would often try to bring in the developers and team leads at this phase, to ensure that what I moved forward with was feasible, within scope, and of value.