A thesis is only worth writing if it changes what you do at intake. This is the mechanics of applying it fast enough to protect the time it was meant to protect.
13 min read · Level 2
The screen that has never rejected something you later wished you had taken is set too loose, and I think investors should expect to feel that regret on a schedule rather than treating each instance as evidence of a broken process. A funnel calibrated so that nothing good ever escapes it is not a funnel; it is a queue with extra steps, and it will consume exactly as much time as having no thesis at all. The honest framing is that you are trading a small number of missed good outcomes for a large amount of attention on the opportunities you are best placed to judge, and that trade is worth making even though the missed ones are visible and the attention is not. What makes this hard is the asymmetry of evidence: the company you declined that went on to do well is a specific, nameable, occasionally public fact, while the twenty-eight hours it bought you on something else shows up nowhere at all. Most people respond by loosening the screen after every visible miss, which is how a process degrades into no process, one reasonable amendment at a time.
Screening is the step between an opportunity arriving and real work beginning. It has one purpose: to spend the least possible time on the things you are going to decline anyway, so the time exists for the things you are not.
The structure that works is a funnel with a fixed budget per stage, and the discipline is that the budget binds:
Stage Time budget Question being answered Intake 5 minutes Does this hit the anti-thesis? Is it inside the thesis at all? First pass 40 minutes Is the load-bearing assumption of my thesis true HERE? Real work 20+ hours Everything else
The expensive error is not declining a good opportunity. It is the forty hours spent on something that was never going to be a fit, which are taken from an opportunity that was.
The tool that makes the forty minutes work is the disqualifying question: the single question whose answer, if it comes back wrong, ends the conversation regardless of everything else. It is derived directly from your thesis. If your belief is that these companies win through the office manager rather than the practice owner, the disqualifying question is who books your demos? If your belief is that this category's economics turn on repeat purchase, the question is what share of revenue this quarter came from customers who bought last year?
A good disqualifying question has a specific shape. It asks for a fact rather than an opinion. It is answerable in one sentence by anyone genuinely running the business. And critically, it is a question whose wrong answer you will accept, which means deciding beforehand what the wrong answer is:
Weak question "How do you think about distribution?" invites a narrative Strong question "Of last month's demos, how many were booked by an office manager?" invites a number
The difference is that the second cannot be answered well by someone who has not looked, and it cannot be answered persuasively in a way that hides the answer. A great deal of what makes screening slow is that most questions asked in first meetings can be answered impressively without conveying any information.
One more piece of structure matters: write the answer down before you decide. The disqualifying answer should be recorded in the same place as the thesis it tests, because a screen produces information about your thesis as well as about the company, and that is the half everybody throws away.
Because deal flow is not a queue that waits. Opportunities have their own clocks, arrive unevenly, and are gone whether or not you have finished thinking. An investor who takes three weeks per opportunity does not do careful work on everything - they do careful work on whatever arrived in a quiet month and rushed work on everything that arrived in a busy one, which is close to random.
There is also a selection problem that screening speed directly affects. The opportunities that push hardest for immediate attention are not, on average, the best ones, because genuinely competitive opportunities do not need to push. If your process has no fast lane for declining, urgency effectively decides your calendar for you, and urgency is correlated with the wrong things.
The deeper reason is that a slow no turns into a soft yes more often than anyone admits. Five weeks of investigation creates sunk cost, relationships with the founder, and a feeling of obligation to the introducer. The decision made at week five is not the decision that would have been made at hour one with the same information, and the difference is not in your favour.
Finally, a fast, reasoned, honestly explained no is good for your deal flow rather than bad for it. People send opportunities to investors who answer. Two sentences naming the actual reason costs you ten minutes and makes the next introduction more likely, and more accurately targeted.
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The setup. An investor's thesis: in small-business vertical software, the winners are bought by the operator who uses the product daily rather than the owner who signs, because the owner delegates any tool decision that is not a large expense. So the growth constraint is reaching operators, and I am wrong if the category leaders in three years turn out to have sold top-down.
Their disqualifying question: of the last twenty demos, how many were booked by someone who would use the product daily? Their pre-decided wrong answer: fewer than half.
Four opportunities in one month.
Company Answer to the question Decision Time spent A 17 of 20 booked by daily users Real work 28 hours B "We do not track that" Declined 45 minutes C 4 of 20; the rest were owners Declined 40 minutes D 11 of 20, trending up from 5 Real work 22 hours
Company B is the instructive one. The answer was not wrong, it was absent, and the investor treated that as disqualifying. Their reasoning: a company whose thesis is operator-led distribution and that does not measure who books demos is not running the motion the thesis requires, whatever the deck says. That is a judgement, and it could be wrong. It was written down as a judgement rather than as a fact, which is what makes it reviewable later.
The arithmetic of the month. Two real investigations at 25 hours and two screens at under an hour: about 51 hours. Had each of the four been investigated properly before a view was formed, the same month would have cost roughly 100 hours, and the two genuine candidates would have received half the attention each. The screen did not just save 49 hours - it doubled the depth of work on the opportunities that deserved it.
What the investor learned about their own thesis. Three of four companies in the category were selling primarily to owners. That is disconfirming evidence about the belief, arriving for free, from a process designed for something else. They noted it beside the thesis with the date. Two more months like it and the falsifier is worth revisiting early.
Using the screen to decide and then never recording what it found. The answers gathered at intake are the cheapest evidence about your own thesis you will ever collect - dozens of primary observations a year about how a category actually behaves - and almost every investor throws them away because the opportunity was declined. The company was the subject of the decision; the category was the subject of the information, and only one of them is filed.
Take the load-bearing assumption and ask what single fact would show whether it holds in this specific case. If you cannot produce such a question, the thesis is probably still a preference, because a real belief about a mechanism implies an observable consequence at the company level.
Write the threshold down first - fewer than half, under a fifth, more than three months. Deciding afterwards means deciding while looking at a founder you like, and the number will move. This is the same discipline as the falsifier, applied one level down.
Questions that can be answered well without data will be, sincerely and persuasively. Ask for last month's figure, the share of the total, the count out of twenty. The refusal or inability to produce it is itself an answer, though treat it as a judgement rather than a fact.
Five minutes at intake, forty at first pass. When the budget runs out, decide with what you have rather than extending, because extensions do not distribute themselves evenly - they go to whichever opportunity is most charming, and that is a poor allocator.
Name the actual reason, not a pleasantry. It costs ten minutes, it makes the next introduction from that person better targeted, and it leaves a record you can check later when you find out how the company did.
Keep a running list of what screens are telling you about the category. This is a free stream of primary evidence about your own belief, collected as a by-product, and it will often reach the falsifier before the falsifier's scheduled date.
Use a formal screen whenever more opportunities arrive than you can investigate, which for anyone with reasonable deal flow is always. It is most valuable in private markets, where each opportunity is presented rather than priced and the effort to evaluate one properly is measured in days.
Do not run a screen on the first two or three opportunities you ever see in a new category, where you do not yet know what the load-bearing assumption is. There the slow work is the point: you are building the model that later lets you screen at all, and disqualifying on a question you have not earned the right to ask will simply encode your first guess as policy. Screening is a tool for a thesis you already hold, not a substitute for forming one.
An investor builds a genuinely good screen and runs it consistently on inbound opportunities. Introductions from close contacts skip it - not deliberately, but because the conversation starts as a favour and a catch-up rather than as intake, and by the time it is clearly an opportunity the informal stage has already consumed several hours and created an obligation. Reviewing a year of decisions, the pattern is usually stark: the investments that came through warm channels received less structured scrutiny than the ones that came in cold, which is the reverse of what anybody would choose deliberately, and it concentrates the portfolio in whatever the investor's immediate network happens to be doing.
Run the screen on warm introductions first, not last. The relationship makes declining harder later, so the cheap moment to ask the disqualifying question is before the conversation has become a favour.
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