Mental model

First principles is one: strip a claim back to what must be true and rebuild from there. A pre-mortem is another: assume the plan failed, then explain why. Six thinking hats separates the facts from the feelings from the objections so that a discussion stops mixing them. A steelman builds the strongest version of the position you disagree with before arguing against it. Inversion asks what would guarantee failure. Opportunity cost asks what this choice quietly gives up.

They are not facts, and they are not opinions. They are procedures — which is the reason they transfer, and also the reason a list of them is so much less useful than it looks.

The part every list of mental models leaves out​

There is no shortage of the models themselves. Charlie Munger’s argument for a “latticework” of them is thirty years old, the canonical lists run to a hundred entries, and most people who care about thinking well have read one.

Almost nobody uses them. The gap is not knowledge, and this is worth being precise about, because the standard prescription — read more of them — treats it as though it were.

• Recall fails at exactly the wrong moment. You know what a pre-mortem is. The question is whether it occurs to you on the Tuesday you are deciding, while you are inside the problem and already leaning toward an answer. Recognition is easy; retrieval under load is not.
• Applying one is real work. Running an assumption audit properly means listing the premises the whole argument rests on and checking each — an hour, honestly done. Faced with an hour, you do the five-minute version in your head and conclude what you were going to conclude anyway.
• Confirmation is the default. The models that would help most are the ones that attack a position you have already grown attached to, which is precisely when you are least inclined to reach for them.
• A model applied to nothing produces nothing. SWOT run against a topic name yields four boxes of generalities. It only earns its keep when it is run against specifics — this paper, this decision, this draft.

So the useful form of a mental model is not an entry in a list you have read. It is a prompt that arrives at the moment of the decision, with the work of applying it already done on the actual material.

How MindMax handles it​

Each skill on the canvas is one thinking model written down as instructions the AI carries out. You pick it from a menu at the moment you need it — which solves recall — and what comes back is that method applied to the document, passage or question you pointed it at, one branch per angle, which solves the hour of grinding.

There are 44 built-in skills

on the canvas, and most of them are a named classic: SCAMPER, six thinking hats, SWOT, first principles, a mental-model latticework, a red team, Socratic questioning, an option matrix, Bloom’s taxonomy. An example library adds a pre-mortem, Porter’s five forces and a business model canvas if you install it. The skills are plain text, so you can edit one, or describe a method you use and have it written up as a skill of your own.

A red team pass on a plan: each weakness is a point you can expand into the full argument — or delete.

What it does not do is make the judgement. A board of applied models is material, not a conclusion — the value is in which branches you keep. Thinking through a decision walks one end to end, including where it gets hard.