Run a small experiment before committing to Plan B or C

Design the smallest possible real-world experience that would tell you something true about a plan before you commit to it.

Why it works

Imagination generates plans that feel real but are not tested against reality; behavioral experiments in cognitive therapy and design thinking both converge on the finding that small, real-world tests update beliefs more durably than reasoning about hypotheticals. A prototype experience — a shadow day, a side project, a 30-day experiment — generates actual data rather than simulated data.

How to do it

1. For Plan B or C, identify the single most uncertain assumption: the thing that, if wrong, would make the whole plan unattractive.
2. Design a 2-to-4-week experiment that tests only that assumption at low cost and reversibility.
3. Define in advance what evidence would confirm the assumption and what would disconfirm it.
4. Run the experiment, then revise the plan based on what you learned — not what you hoped.

Evidence

Behavioral experiments as an epistemic tool are central to cognitive-behavioral therapy and to design thinking; both bodies of practice find that small real-world tests produce better belief updates than reasoning alone. (clinical)

Behavioral experiments are well studied in CBT for anxiety reduction; their application to life-design decisions is a principled extrapolation from that evidence base.

Common mistake

Designing an experiment that is too large to be reversible — a "prototype" that is actually a full commitment defeats the purpose. The experiment should be something you can walk away from at low cost.