I like what the RACI responsibility assignment matrix tries to do in clarifying roles and responsibilities. In practice, I tend to favour RASCI which adds a 'support' role.

But I also agree with this article by Clay Parker Jones which suggests an alternative.

RACI is vague, hard to use, and reinforces the "what the hell is happening here" status quo. DICE is specific, easy to use, and shines a bright light on dysfunction.

Source: Use DICE instead of RACI | cpj.fyi