It helps to acquire team members from a range of different departments within the company (e.g. marketing, customer service, development, etc), although design sprints can still be effective with a team of two or three as long as there’s at least one designer.
Name one facilitator, and one decider. A facilitator helps to move things along, and a decider has the final say. A facilitator should feel confident enough to request the role, enforce regular breaks, keep the team energized, and constantly ask “Why?” to ensure that the team reaches thoughtful conclusions. A decider should be able to make solid decisions when requested, as slow decisions will destroy team spirit and drain energy.