The most common reason experienced people give for not writing a book is that they do not have enough material yet.
It is almost never true, and the reason it feels true is worth understanding, because the same mistake produces bad books when people eventually do start.
What people are picturing when they say this is a complete book. Everything they know about their field, organised, complete, with nothing important left out. Measured against that, nobody has enough material, including the people who have been doing the work for thirty years. The field is larger than any career.
A book is not that. A book is one argument, supported by evidence, at enough length to be convincing. The material required is not everything you know. It is enough to make one case properly.
Most experienced professionals cleared that bar years ago and have been adding to a pile they will never use.
The useful question is not whether you have enough. It is what you have enough for, which is a different question with a checkable answer.
Work out what you could argue for two hundred pages with evidence you already have, because that is a smaller thing than the book you have been imagining.
How much material does one book need?
Less than people think, and more of a particular kind.
A book needs one claim, five or six situations where you saw it hold, two or three where it did not and you can explain why, and a working knowledge of the standard objections. That is the structural requirement.
What it does not need is complete coverage of your field. Books attempting that read as surveys, and surveys are written by people who did not have a position.
So the test is not how much do you know. It is do you have one thing you believe, with evidence, that somebody competent might dispute.
Why does the pile keep growing without becoming a book?
Because unsorted experience does not organise itself.
Twenty years of work produces an enormous quantity of material and no structure. Every year adds more, and more makes the sorting problem harder instead of easier, which is why people who wait feel further from a book each year, not closer.
That is the opposite of what waiting is supposed to achieve, and it is why the phrase not enough material yet is misleading. The problem is never quantity.
What produces a book is somebody imposing a shape on the pile, and that has to be done deliberately at some point regardless of how large the pile has become.
What counts as evidence?
Things you watched happen, with detail attached.
A decision you made and the constraints you made it under. A time the standard approach failed and what you did instead. A project that went wrong in a way you can now explain. A pattern you have seen enough times to trust.
What does not count is what you have read, what is generally believed in your field, or a principle you agree with but have not personally tested. Those are available to anybody and they produce a book anybody could have written.
The material that makes a book yours is the material you cannot look up.
Does more experience produce a better book?
Up to a point, and past it the return goes flat.
Somebody five years in has enough for a narrow book about the thing they do. Somebody fifteen years in has enough for a broader one with better evidence. Somebody thirty years in does not have twice the book that the fifteen-year person has, because the additional years mostly confirmed what was already understood.
What long experience does supply is confidence about the exceptions, which is worth having and is not worth waiting a decade for.
The curve flattens earlier than anybody expects, which is another argument against postponing.
What do you do about material you are not allowed to use?
Every experienced person has some and it is worth naming early.
Work under agreement, clients who would be identifiable, projects that ended badly with people still in the industry, anything that touches litigation. Some of your best examples are in that category and they are not available.
That is a real constraint and it is smaller than it appears. Most of what makes an example useful survives generalisation, because the lesson is in the mechanism instead of in the name of the company.
What does not survive is a story whose whole point is who it happened to. Those stay out, and there are fewer of them than people fear.
How do you find out what you have?
By being asked, which you cannot do to yourself.
Almost nobody can inventory their own experience usefully. What you remember when you sit down to list your material is the same handful of stories you always tell, and those are frequently the least useful ones because they have been smoothed by repetition.
The material that carries a book usually surfaces sideways, in the middle of answering a question about something else. Somebody asks about a project and you mention, in passing, a decision you have never described to anybody.
That is why the inventory happens in conversation instead of on paper, and why people are consistently surprised by what turns out to be in there.
What if you are not ready to write a book yet?
Then it is usually a position, not a material problem.
Somebody with plenty of experience and no book in it typically has not yet decided what they think. They can describe what happened without being able to say what it means, and the second one is what a book requires.
That is a real situation and it does not get solved by more experience. It gets solved by thinking, or by somebody asking the right questions until the position surfaces.
Which is a shorter piece of work than another five years of accumulating stories.
