The investment memo is the most underrated skill in venture. It is the document your partners read, the record of your reasoning, and, when you are right, the thing that made the case at the moment of decision. A weak memo loses good deals. A strong one wins debatable ones.
The structure matters less than the honesty. A useful memo covers the company's purpose in a sentence, the problem and who has it, the solution and why it is better than the alternatives, why now, the market, the competition, the product as it exists today, the business model and unit economics, the team, the traction, the deal terms, and, the part most people rush, the risks. Then it ends with a recommendation and a conviction level you are willing to be held to.
The risks section is where memos earn their keep. A memo that only makes the bull case is not analysis; it is advocacy, and your partners can smell it. The strongest memos state the bear case as well as a skeptic would, then explain why you are investing anyway. Conviction that has stared down the downside is worth far more than conviction that ignored it.
Numbers belong in a memo, but only the ones that matter. At the early stage that is usually growth, retention, and the basic unit economics, what a customer is worth and what it costs to acquire them. Burying the committee in metrics is a way of hiding that you do not know which ones count.
The conviction score is the discipline. Putting a number on how strongly you would back the deal forces a real position instead of a hedge. It also makes you accountable later: when you revisit the memo after the company succeeds or fails, your stated conviction tells you whether your judgment was calibrated or lucky.
A good memo is short, honest about risk, specific about the few metrics that matter, and ends with a number you would defend. Write enough of them and your judgment compounds, because every one is a bet you can grade yourself on.
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