The minimum needed at each stage to get buy-in, inform, and help plan. For example: 1. At inception, a one-pager to make the business case and get funding/bac

The minimum needed at each stage to get buy-in, inform, and help plan. For example: 1. At inception, a one-pager to make the business case and get funding/backing/ok/whatever. Audience: executives 2. Before starting, the end-user perspective on what is going to be done. Get feedback, use for sizing/scheduling. Audience: other departments 3. Before too much construction (after a proof-of-concept), an overview of the basic architecture and sketch of a plan. Audience: other developers.