Build in buffer

Add deliberate slack to estimates and schedules so reality doesn’t break the plan.

Why it works

People systematically underestimate how long things take and how much disruption a day holds, so a plan with no slack is fragile by design. Buffer absorbs the inevitable overruns and surprises, protecting the essential work from being crushed by cascading delays and reducing the chronic stress of running at full capacity.

How to do it

1. Add a margin (e.g. 50%) to time estimates rather than planning for the best case.
2. Leave unscheduled space in the day for the unexpected.
3. Prepare for likely obstacles in advance instead of assuming a clean run.

Evidence

Directly motivated by the planning fallacy — robust evidence that people’s time estimates are systematically optimistic — making built-in slack a rational correction. (observational)

The bias is well documented; the right amount of buffer is individual and found by trial, not prescribed.

Sources

• Buehler, Griffin & Ross (1994), the planning fallacy, J. Personality & Social Psychology

Common mistake

Planning every day at 100% capacity, so the first surprise topples the essential work along with everything else.