The document describes the Design Sprint methodology, which aims to build and test prototypes in just five days to quickly validate hypotheses about customer needs and preferences. It involves six phases: Understand to create a shared knowledge base; Define success metrics and principles; Sketch a range of ideas individually; Decide on a direction to prototype; Prototype the concept; and Validate the prototype with users. Various methods are provided for each phase, such as affinity mapping, card sorting, crazy 8's, dot voting, and usability studies. The timeline allocates one day for each phase with the goal of compressing months of work into a single week to shortcut debate and quickly learn.