I would like to propose an alternative to Design Sprints : Cover Story.

This is not an official “Process” and it is not intend it to be so. This is an experiment to find the best way to facilitate early, fast discovery of problems and solutions. This is an experiment that might work well or fail miserably.

The Cover Story starts off as a design sprint, but progresses in a different manner. The idea is to get something functioning reviewed by the customer and to discover the true scope and direction of the feature.