Start with outcomes. The mission is really a summary of the whole thing, and you cannot write the summary until you have written the essay. Treat the mission as the key line, and let everything else come first.
You do not know what competencies you need until you know the outcomes, so ask what you want this person to accomplish in the next 12 to 18 months. Have at least three; three to five is the sweet spot; eight is the ceiling and probably already too many. Trust your gut. Think in terms of big projects. If a sales operations person needs to lead a new CRM rollout, or a head of marketing needs to stand up a marketing automation system, ask what should be possible 12 to 18 months out that is not possible today, the things that will be routine and almost commoditized if this person succeeds. Give each outcome a sentence or two, and a metric or signal that tells you in black-and-white terms whether it was hit. These are the outcomes you will hold the person accountable to: on track to hit them is a good performance review; on track to miss two of five is not meeting expectations. You set that standard up front, in the onboarding document.
Only once you have the outcomes do you work out the competencies, the things someone would have to be great at to deliver those results. Sort them through the Competency Stack, which separates the role-specific, level-specific, company-values, company-stage, and team-fit abilities. Competencies are not just how you pressure-test the outcomes. They are how you build the interview guide, because how can you really interview if you do not know what you are interviewing for? Once you know your outcomes and competencies, you know exactly what to test for, and you can design an interview loop that gets real signal on each one. If you want to see what a finished MOC looks like, Andreessen Horowitz published a sample one in their hiring-process walkthrough. [1]
When you write the competencies, be explicit about which strengths are must-haves and which weaknesses you can live with. Everyone you hire will have things that are not perfect, things that will probably bug you a little, because nobody is. If you decide up front what an acceptable weakness looks like, you are far less likely to have someone torpedo the hire at the end, and far more likely to enjoy working with the person, because a weakness you have already accepted is something you roll with instead of something the team relitigates every quarter. The trap runs the other way too. Ben Horowitz, who cofounded Andreessen Horowitz, takes a principle from Colin Powell: hire for strength, not for the lack of weakness. He puts the failure mode sharply:
The group will often find the candidate’s weaknesses, but they won’t place a high enough value on the areas where you need the executive to be a world-class performer. As a result, you hire an executive with no sharp weaknesses, but who is mediocre where you need her to be great. If you don’t have world-class strengths where you need them, you won’t be a world-class company. [3]
So name the strengths the role cannot afford to be mediocre at, and protect them. The MOC is where you write both the must-have strengths and the acceptable weaknesses down.
Write the mission last. Two to four sentences on why the role exists. If you cannot write it clearly, you probably do not understand the role yet.
If this is your first time hiring for the role, do a couple of calibration calls. One of the hard parts of being a founder or an executive is that you constantly have to hire for jobs you have never done yourself. Draft your outcomes and competencies, then show them to a few people who are great at that job, or who have managed people who are, and check three things: whether your outcomes are reasonable, whether you are holding a high enough standard, and whether you have missed a competency that turns out to be critical.
One more key: you do not have to do this with a blank page and a cursor blinking at you. Some people write well that way; plenty do not. It is often far easier to let an AI ask you about the outcomes, grill you on what they really are and what competencies they require, even suggest competencies worth considering. That is an outstanding use of AI, because it gets what is in your head out, especially if you are dictating instead of typing. It is a real power move, and it is exactly what Agent Mode does for the MOC.