The 6-Step Decision System

Why structure matters

Most people make significant decisions the same way they make minor ones: by thinking about the situation until a preferred option emerges, then looking for reasons to support it. This process works reasonably well for low-stakes, reversible decisions where feedback is fast. It is unreliable for decisions where the stakes are high, the outcome will not be visible for months or years, and the biases operating are invisible to the decision-maker.

The problem is not intelligence. Intelligent people make systematic decision errors because intelligence, without structure, primarily makes you better at building elaborate justifications for positions you already hold. Research by Philip Tetlock, whose superforecaster studies tracked thousands of predictions, found that structured, deliberate reasoning processes produced significantly better predictions than unstructured intuition, even when the structured reasoners were less expert in the subject matter.

The 6-step decision system is not a replacement for judgement. It is a structure that forces judgement to operate on the right material, in the right sequence, before a commitment is made. Each step addresses a specific and well-documented failure mode in human decision-making.

The six steps

Step 1: Capture. State the decision clearly in one precise sentence. Name who is affected and what the stakes are. Most decisions feel harder than they are because they have never been stated precisely. "I need to figure out my career" is not a decision. "Should I leave my current role and join Company X as a senior manager by 1 September?" is a decision. The discipline of capturing the decision in a single sentence forces you to identify what is actually being decided, who bears the consequences, and what timeline applies. If you cannot write the decision in one sentence, you are not yet ready to decide — you are still in the problem-definition phase.

Step 2: Frame. Answer four targeted questions designed to surface what you may have missed, assumed, or avoided. What are you actually deciding — and what are you not deciding? What would change if you did nothing? What is the best outcome you are genuinely hoping for? What would have to be true for your current preferred option to be wrong? These questions do not produce the answer; they expose the shape of the decision and the assumptions built into it. Framing is where most analytical omissions are caught before they become decision errors.

Step 3: Model. Identify the most relevant mental model for your specific decision type. Life pivots with long time horizons respond to the Regret Minimisation Framework. Financial bets with estimable probabilities respond to expected value thinking. Complex execution risks respond to inversion — asking what you would need to avoid rather than what you need to achieve. First-principles thinking helps when the standard approach in your field is producing consistently poor results. The model does not decide for you; it provides the lens through which to structure your analysis. Choosing the wrong model is worse than using no model, so spend time identifying which decision type you are facing before selecting one from the 30+ available frameworks.

Step 4: Detect. Identify the two or three cognitive biases most likely to be distorting your thinking on this specific decision. Not every bias is active in every decision. For a career move, status quo bias, loss aversion, and social proof are typically the most active. For a financial investment, overconfidence, anchoring to the purchase price, and the sunk cost fallacy are the most common distortions. Naming the specific biases at work gives you a concrete checklist rather than the useless instruction to "watch out for bias." For each bias identified, ask one question: in what specific way might this be pushing you toward your current preferred option?

Step 5: Stress-Test. Apply the mental model selected in Step 3 to your decision and run a pre-mortem. Imagine it is 18 months from now and the decision has been executed. It has failed — not partially, but clearly and significantly. Write down, in as much detail as you can, what caused the failure. The pre-mortem, developed by psychologist Gary Klein, works because it gives people explicit permission to think about failure before committing, surfacing risks that were present but suppressed by optimism or the desire to appear decisive. The goal is not to produce a reason to abandon the decision but to break the decision before reality does — and address the most plausible failure modes in the execution plan.

Step 6: Decide. Reach a clear verdict — Proceed, Proceed with Conditions, or Reconsider — and commit to your first action. Write down the reasoning that led to the verdict, the alternatives you considered and why you rejected them, and the risks surfaced in Step 5 alongside how you plan to address them. A decision without a written record is a decision you cannot learn from. The act of writing the verdict and the reasoning is the final step of the analysis and the first step of the execution.

When to apply the full system

Not every decision warrants all six steps. Reserve the full process for decisions that are hard or impossible to reverse, where the consequences will compound over more than 12 months, where significant resources or relationships are at stake, or where you feel strong emotional pull toward a particular option. These conditions indicate that the decision is consequential enough for structured analysis and that the biases are likely to be most active.

For reversible, low-stakes decisions with a short feedback loop, the overhead of the full system outweighs its benefits. A hiring decision for a senior role warrants all six steps. A decision about which content to publish next week does not.