Planning that survives contact with the week

Most people plan a week that could only be executed if nothing unexpected happened, and then treat the unexpected as an aberration rather than as the reliable feature it is.

The estimation problem

The planning fallacy is one of the more robust findings in judgement research: people underestimate durations and costs, persistently, including for tasks they have done before.

The proposed mechanism is that planning proceeds by imagining the task going well rather than by referring to how similar tasks have gone.

The correction that works is to use the outside view: how long did this take last time, or how long does it take people generally.

A cruder version works nearly as well. Estimate, then multiply. Most people find their own multiplier is somewhere between 1.5 and 2, and it is remarkably stable once measured.

The unplanned time

The second failure and the larger one.

A week contains meetings that will be scheduled, requests that will arrive, problems that will occur and administration that will accumulate.

None of it is on the plan and all of it is certain in aggregate, even though no individual item is predictable.

Which means planning to fill available hours guarantees failure, and the failure is arithmetic rather than personal.

Tracking what proportion of a week actually goes to unplanned work — for a fortnight, honestly — produces a number people find uncomfortable and can then plan around.

What a workable plan looks like

Plan a fraction of available time. Half is a common starting point and frequently still optimistic.

The remainder is not slack in the sense of doing nothing. It is the capacity that the week's actual demands will consume.

Identify three outcomes, not a list of twenty tasks.

A short list forces prioritisation. A long one permits the comfortable illusion that everything will be done, and reliably produces a week where the urgent items were completed and the important ones were not.

Schedule the important work first, before the calendar fills.

Work without a slot goes into the residual time, and the residual time is what gets consumed by everything else.

Decide the first action for each item. Ambiguity about what to do first is where things stall, and it is resolvable at planning time when there is no pressure.

The daily version

Three items rather than a list.

One that must happen, two that should. Anything beyond that is a bonus rather than a shortfall.

The psychological difference between finishing a three-item list and getting halfway through a ten-item one is substantial, and the work completed is frequently identical.

The review that makes it work

Planning without review does not improve.

A short weekly review — what was planned, what happened, what got in the way — produces the calibration data that fixes estimation.

Three questions are enough. What did I finish? What did I not, and why? What is the actual constraint?

The third question is the useful one, and the honest answer is frequently the same every week, which is itself the finding.

When the plan is not the problem

Worth distinguishing, because planning technique gets applied to problems it cannot solve.

If the workload genuinely exceeds available time, no planning method resolves it. The response is to reduce commitments or to escalate, and better planning simply produces a more accurate picture of an impossible situation.

That picture is useful — it is what makes the case for reducing scope — and it should not be mistaken for a solution.

Similarly, if the same item has been carried forward for six weeks, the problem is not scheduling. Either it is not actually important, or something about it is being avoided, and both are worth naming rather than rescheduling.

The Friday version

The single practice that does most of the work here.

Twenty minutes at the end of the week: what actually happened, what is still outstanding, what the next week must contain.

Doing it on Friday rather than Monday matters, because the information is still in your head and because it removes the low-grade weekend awareness of unfinished things whose shape you cannot quite remember.