Why is documenting design decisions important?
Documentation helps you organize and deliver your thoughts to stakeholders, which in turn helps them understand how your design decisions will satisfy the user needs and their own business objectives. Designers need to find a sweet spot between business goals and user needs.
What is a key design decision document?
Key Design Decision Documents help record important thought processes for communicating with current and future team members. It details the key decisions that the organisation is going to take over a period of next four months.