Design sprints

A design sprint is a short, structured process for answering a big question quickly. Jake Knapp developed it at Google Ventures.
The classic sprint takes five days, one for each step shown in the example: map the problem, sketch ideas, decide on the best one, build a prototype and test it with real users.
Because the team tests a realistic prototype by the end of the week, it learns whether an idea works before spending months building it.