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Scenario planning

The mid-horizon — three to ten years — is the planning window most people skip. Tactical planning covers next month; goals cover next year; nobody plans the in-between. Scenario planning is the discipline of making plans that survive multiple plausible futures rather than betting everything on the one you hope for.

Why predict less, plan more

Forecasting is hard and badly suited to personal decisions. Even professional forecasters have humbling track records on multi-year predictions. The honest position is that you don't know exactly what AI capability, geopolitical alignment, your industry, your health, or your relationships will look like in 2030.

Scenario planning trades the impossible job (predicting) for the doable one (preparing). Instead of one plan that assumes the future you hope for, you write three plans for three plausible versions, then concentrate on the moves that work across most of them.

The three-scenario template

The standard structure for personal scenario planning:

  1. Base case. The future you broadly expect — extrapolating current trends, your current career trajectory, your current relationships. Write down the assumptions. They're probably half-wrong; that's information.
  2. Pessimistic case. A plausible bad version. Not the worst-imaginable; the realistically-bad. Job lost, partner's job lost, illness, market downturn, location forced change. What would actually happen?
  3. Optimistic case. A plausible better version. Promotion, business takes off, unexpected windfall, life expands. Equally important to plan for, because windfall money and time are wasted without a plan.

For each scenario, answer three questions: what would I do in the first 30 days, what would my financial / career / relationship position need to be, and what would I have wished I'd started a year ago?

The two-axis method

A more rigorous variant uses two axes of uncertainty that matter most to your decision, producing a 2x2 grid of futures. For someone in their late thirties thinking about location and career, the axes might be (1) does remote work continue to be normal, and (2) does my industry consolidate.

The 2x2 grid produces four corners. The discipline is to ask: what moves work in three or four of these corners? Those are robust. Moves that work in only one corner are bets — fine, but consciously placed bets rather than assumed certainties.

Robust moves

The point of scenario planning isn't to be right about the future. It's to identify moves that work across most plausible versions of it. Patterns that show up reliably as robust:

Notice these are most of the things adult life advice converges on, regardless of the specific scenarios. That's the validation — robust moves are robust precisely because they work in most futures.

When to revisit

Annual revisit is the minimum. Some scenarios will have become more likely; some less. The base case usually shifts every 12-18 months as you accumulate new information. Major life events (marriage, divorce, job loss, illness, major financial change, child, parent's illness) trigger an unscheduled revisit.

The act of writing the new version usually produces more clarity than the document itself. Plan to do it; the document is a byproduct.

Common mistakes

  1. Planning only one scenario (the optimistic one, usually).
  2. Treating scenarios as predictions rather than as preparations.
  3. Catastrophising one extreme bad scenario rather than writing three plausible ones.
  4. Skipping the optimistic scenario.
  5. Never revisiting.
  6. Treating the document as the work rather than the thinking.
  7. Confusing scenario planning with worry — they produce opposite outcomes when done well.

Related

FAQ

How is this different from goal-setting?
Goals assume the world cooperates. Scenarios assume the world might not. A goal might be ‘move to Lisbon by 2028.’ A scenario plan asks: if the EU policy on remote work changes, if Lisbon's housing costs double, if family circumstances shift, if my industry restructures — how does the goal hold up? It's planning under uncertainty rather than planning for the expected case.
Doesn't this just produce anxiety?
Done badly, yes. Done well, it does the opposite — by surfacing what you'd actually do in plausible bad cases, scenarios reduce the anxious uncertainty about what would happen. The named fear is smaller than the unnamed one.
How many scenarios should I plan?
Three is the canonical answer. Pessimistic, base case, optimistic — broadly. Two is too binary; five gets fiddly without adding much. Plan three; revisit annually.
What timescale?
For personal decisions, three to ten years is the useful window. Shorter and it's tactical; longer and it's science fiction. Scenarios are tools for the medium horizon — the one most people skip.
Is this just for finances?
No — relationships, career, location, health, and family scenarios all benefit. Money scenarios are popular because they're quantifiable, but the technique transfers anywhere you're making medium-horizon bets.
What's the difference between scenario planning and worst-case thinking?
Worst-case thinking is one scenario; scenario planning is several. The discipline of writing the optimistic and base case alongside the pessimistic prevents the catastrophising that pure worst-case thinking can produce.