A prototype needs a clear question and a deliberate boundary. Deciding which parts to leave rough gives a team room to test a useful idea before presentation details begin to settle the discussion.
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Research
Looking closely enough to ask a more useful question. Following observations, conversations, drawings, and practical tests without making the first answer do all the work.
The stories
A clean drawing can make a complicated plan seem settled. Following the paths on the page reveals the space still missing between its boxes, from the place someone waits to the door they need to open.
An interface sets a pace through familiar controls, visible progress, and the moment it tells us a task is finished. Looking closely at those transitions reveals where a little patience belongs and where it becomes unnecessary work.
A revision goes better when the current version has been read carefully. Before moving another line, sort observations from suggestions and decide which question the next draft is meant to answer for the people reviewing it.