Google Design Sprints
https://www.youtube.com/watch?t=2&v=qvdO0G4uQgc
Google Design Sprints were originally developed at Google Ventures to help their startups move quickly from problem to idea to prototype to feedback, all in five days time. They can, however, have much broader application, in companies of every size, and in agencies, as they work with clients to iterate on new campaigns.