The pre-mortem: imagine it failed, then decide

A pre-mortem is a simple thought experiment: before you commit to a decision, imagine it's a year or two from now and the choice has failed badly. Then ask yourself why. Instead of planning for success and hoping nothing goes wrong, you assume the worst has already happened and work backwards to explain it. The technique comes from psychologist Gary Klein, who noticed that people are far better at spotting flaws in something that has already gone wrong than in something they are still hoping will go right. By pretending the failure is real, you give yourself permission to name the risks you were quietly ignoring.

The power of it is psychological. When you're excited about a plan, your mind protects the plan. You downplay the warning signs because they're inconvenient. A pre-mortem flips the frame so completely that those same warning signs become the thing you're looking for. You stop defending the decision and start investigating it. That small shift surfaces things that no amount of optimistic planning ever would.

Why optimism hides the risks that matter

When you imagine the future, you tend to imagine it going well. This isn't a character flaw; it's how the mind works. We picture the new job and see ourselves thriving in it. We picture the move and see the sunny version of the new city. The brain runs a highlight reel, not a risk report. And the more emotionally invested you are, the brighter that reel gets.

There's also a social layer. Once you've told people you're leaning toward something, raising doubts can feel like backing out. Inside your own head, the doubts feel disloyal to the version of you that already decided. So the risks don't get examined; they get suppressed. They don't disappear, though. They wait. A pre-mortem is a way of inviting them into the room on purpose, while you can still do something about them, rather than meeting them later as a surprise.

This is also why a pre-mortem often beats a pros and cons list. A pros and cons list treats every item as equal and static, and it rarely captures the failure modes that actually sink a decision. If you've ever felt that your list looked balanced but still left you stuck, the problem may be the tool itself, not your thinking. There's more on that in our piece on what to do when a pros and cons list doesn't help.

How to run a pre-mortem, step by step

You can do this in twenty minutes with a piece of paper. The structure matters more than the time you spend. Here is a version that works for personal decisions, not just business plans.

First, state the decision plainly. Not 'should I make a change' but the specific thing: 'I take the offer in Denver and we move in September.' The clearer the decision, the clearer the failure you can imagine. Second, travel forward in time. Pick a concrete horizon, say eighteen months, and write a single sentence as if it already happened: 'It's now eighteen months later, and taking this job was clearly the wrong call.' Sit with that sentence until it feels real rather than hypothetical.

Third, and this is the core move, write down every reason it failed. Don't filter. Don't rank yet. Just generate. Aim for ten reasons, because the first three are obvious and the interesting ones tend to come later. You might write: the role wasn't what the title suggested; my partner never settled and I felt guilty; the money looked good but the cost of living ate it; I missed my friends more than I expected; the boss who hired me left in month four. Fourth, for each reason, ask whether it was foreseeable. Some failures are bad luck. Many are things you half-knew and chose not to look at. Fifth, turn the foreseeable ones into questions or safeguards. What would you need to verify before deciding? What would you put in place to reduce the risk if you went ahead?

The questions that make it work

A pre-mortem lives or dies on the quality of the questions you ask yourself once the failure is on the table. A few that tend to open things up: What did I know on some level but never said out loud? Which of these failures would I have predicted if a friend were making this exact choice? What had to be true for this to work, and was I assuming it or had I checked it? Whose behaviour was I counting on that I can't actually control?

That last one is worth dwelling on. A surprising number of decisions fail because they depend on someone else acting a certain way: a manager keeping a promise, a partner adapting, a market staying steady, a version of yourself who has more discipline than the current one. Naming those dependencies is half the value of the exercise. The right question at the right moment can change how the whole decision looks, which is something we explore in our piece on the three questions that change how people see their decisions.

A pre-mortem is not the same as fear talking

It's worth being honest about a trap here. A pre-mortem is a deliberate, bounded exercise: you imagine failure on purpose, for a set period, then you stop and look at what you found. That is very different from anxious rumination, where the mind loops through disaster scenarios with no exit and no action. One produces a list you can act on. The other just produces dread.

The difference is direction. A pre-mortem moves toward a decision; it generates specific, checkable risks and then asks what to do about them. Rumination moves in circles and tends to inflate vague catastrophes that you can neither verify nor address. If you notice the exercise tipping into spiralling, that's a signal to come back to concrete questions: not 'what if everything goes wrong' but 'which specific thing could go wrong, and is it foreseeable?' Fear shapes more decisions than we like to admit, and learning to tell useful caution from background fear is its own skill, one we look at in how fear quietly shapes your biggest decisions.

What to actually do with what you find

The point of a pre-mortem is not to talk yourself out of things. Plenty of good decisions survive a pre-mortem with flying colours, and going ahead anyway, eyes open, is a perfectly good outcome. The point is to change the decision from a leap into something more deliberate. Once you have your list of foreseeable failures, you generally have three options for each one.

You can verify. If a risk rests on an assumption, go check it. If the worry is 'the role wasn't what the title suggested,' that's a conversation to have before you sign, not after. You can mitigate. If the risk is real but manageable, build in a safeguard: a financial cushion, a trial period, a clear conversation with the people affected, an agreed point at which you'll reassess. You can accept. Some risks you simply choose to carry because the upside is worth it; naming them means you won't be blindsided, and you'll recover faster if they land.

It also helps to ask how reversible the decision is, because that changes how much weight your pre-mortem findings deserve. A choice you can walk back cheaply can tolerate more risk than one you can't undo. If most of your imagined failures are recoverable, that's reassuring; if they're permanent, the exercise has earned its keep. Our piece on reversible versus irreversible decisions offers a simple test for telling them apart.

A worked example

Say you're deciding whether to leave a stable job to start something of your own. The optimistic plan is vivid: freedom, ownership, work that feels like yours. Run the pre-mortem and you write the failure sentence: 'Two years on, the business folded and I wish I'd stayed.' Now the reasons come. I underestimated how long it would take to earn anything. I burned through savings faster than planned. I was good at the craft but hadn't realised how much of the work was selling. My partner carried the financial stress and it strained us. I missed the structure and colleagues more than I expected.

None of those are reasons not to do it. But each one is now a question. How many months of runway do I actually have, not in the optimistic case but the slow one? Have I tested whether I can sell, or am I assuming I can? Has my partner truly signed up for the lean period, or have we avoided that conversation? You haven't killed the dream. You've made it survivable. That's the whole move: turning a hope into a plan with its eyes open.

The quiet value of imagining failure

What a pre-mortem really does is grant you a kind of foresight you can't get by thinking positively. It borrows the clarity of hindsight and lends it to a decision you haven't made yet. The risks were always there; the exercise just gives you a socially and emotionally acceptable way to say them out loud, to yourself, before they cost you anything.

This is the kind of thinking Selaro is built for: not telling you what to choose, but helping you ask the questions you've been avoiding and look squarely at what you already half-know. A good decision rarely comes from more optimism. It comes from being willing to imagine the failure, in detail, and deciding anyway, or deciding differently, with your eyes fully open. If you want to see how that kind of thinking partner works, you can read more about our approach on the how it works page.