When startups start to run low on cash, they can extend the runway two ways: by cutting costs or by raising additional funds. But when entrepreneurs … - Eric Ries

The problem for startups and large companies alike is that employees often follow the products they develop as they move from phase to phase. A common practice is for the inventor of a new product or feature to manage the subsequent resources, team, or division that ultimately commercializes it. As a result, strong creative managers wind up getting stuck working on the growth and optimization of products rather than creating new ones.

focus on the boring stuff: how to measure progress, how to set up milestones, and how to prioritize work.

The sandbox also promotes rapid iteration. When people have a chance to see a project through from end to end and the work is done in small batches and delivers a clear verdict quickly, they benefit from the power of feedback. Each time they fail to move the numbers, they have a real opportunity to act on their findings immediately. Thus, these teams tend to converge on optimal solutions rapidly even if they start out with really bad ideas.