A RACI matrix stops the “I thought you were doing that” conversation before it starts.
It’s a grid. Down the left side, you list the tasks or decisions. Across the top, you list the people or roles. Where they cross, you mark what each person’s relationship is to that item:
- R — Responsible. The person doing the work.
- A — Accountable. The person who owns the outcome and gets to say it’s done.
- C — Consulted. The person whose opinion matters before a decision is made.
- I — Informed. The person who needs to know after the decision is made.
Why it matters
The most common failure mode on a project isn’t that nobody does the work. It’s that two people think they’re both responsible, or nobody thinks they’re responsible at all.
I’ve seen projects where a critical sign-off got delayed for weeks because three people assumed someone else was handling it. I’ve seen projects where a decision took twice as long as it should have because the person who actually had authority wasn’t on any of the distribution lists.
A RACI matrix makes these gaps visible. If a row has no A, something is broken. If a row has two As, you’ll get arguments. If a column is all Is, you’ve assigned someone a purely ceremonial role and they probably don’t need to be there.
How to use it
Start with your task list — the things that need to happen, in rough order. Then go row by row and assign roles. Be specific. “The project manager” is fine; “everyone” is not.
The spreadsheet is set up so you can add rows as new tasks appear and add columns as new people join. That’s the point — it’s a living document, not something you fill in once and file away.
Review it before major decision points. If someone is about to be asked for a sign-off and they’re not marked as A or R on that row, pause and fix the matrix first.
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It’s blank. That’s the point. Fill it with your project’s reality.