Most checklists fail, and they fail in predictable ways. They're too long, too vague, written by someone else, and treated as a scoring sheet. Gawande and the aviation-checklist designers he interviews, notably Boeing's Daniel Boorman, have worked out what a working checklist looks like. It transfers cleanly to investing.
It is short and it is lethal. A good checklist has roughly five to nine items and takes under a minute or two to run. Once it turns into a to-do list of everything that could ever matter, people stop using it. They skip it under pressure, which is when they needed it most. The art is ruthless selection of the killer items, the small set of steps that are (a) commonly skipped and (b) catastrophic when skipped. Not "everything important." The dangerous, forgettable things. Your quality-of-earnings work has forty checks. Your top-level checklist has one line pointing to it ("QoE screen run and passed?"). The depth goes in the sub-checklists and the artifacts, and the master checklist is a set of triggers.
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Read-do vs do-confirm, and when to run the list
It is a pause, not a scoreboard. There are two structural types, and you should know which one you're running. A read-do checklist is executed as you go. You read the item, do the task, read the next, the way you'd follow a recipe or a launch sequence. A do-confirm checklist is run from memory and experience first. Then you reach a defined pause point. You stop there and confirm out loud that each critical item was in fact done. For investing, your master checklist is almost always do-confirm. You do your full analysis in whatever order your mind and the company demand. Then, before you commit, you run the list to confirm you didn't skip a killer step. This matters because it tells you what a checklist can't do. It isn't a mechanical formula that spits out "buy" once enough boxes are ticked. Ticking every box doesn't make something a buy. Failing a box is a veto, or a flag that sends you back to work. The checklist protects against errors of omission. It doesn't make the decision.
It has a trigger and a pause point. In aviation, checklists fire at defined moments: before takeoff, on an engine failure, before landing. Yours need the same. Run the full list before initiating or adding to a position, and again before selling. During a teardown, run the fast version, the starred items. Without a defined pause point, a checklist is a document you own but never open.
How do you build an investment checklist?
It is built, not bought. You may start from a template. The course gives you one, and the Mental-Model & Moat Checklist is a shared analytical spine everyone should run. But the part that saves you is the part that comes from your own mistakes, in your words, pointing at your specific recurring failure. Building that part is the heart of the whole method.