Role
A set of responsibilities, activities, and authorities granted to a person or team. A role is different from a job title; one person can hold multiple roles.
Impact
Clarifying roles prevents "Responsibility Clashes" and gaps where "I thought you were doing that."
Weinto take
We define roles explicitly but keep them Fluid. In a high-performing team, roles blur. A developer might take on the "Tester" role for a day; a Product Owner might help with documentation. We value T-Shaped people who can step outside their primary role to help the team win.