RACI
Responsible, Accountable, Consulted, Informed. A matrix for deciding who actually does the work, who takes the blame, who gets to have opinions, and who just receives the email.
Heard in the wild
“Before we kick off, let's build a RACI so nobody can claim they didn't know this was their job.”
Tone check: Professional
Legitimately useful. If someone proposes a RACI, they've probably been burned by ambiguity before.