Pre-set your exit criteria

Decide in advance what result would make you stop, continue, or scale up.

Why it works

Pre-committing to exit criteria prevents the sunk-cost fallacy — continuing a failing approach because stopping "feels like giving up." It also prevents premature abandonment: people who have not defined success often stop when motivation dips rather than when evidence warrants stopping. Clear criteria move the stopping decision from an emotional moment to a pre-planned evaluation.

How to do it

1. Before starting, write three outcomes: the result that would make you stop, the result that would make you continue as-is, and the result that would make you scale up.
2. Make each outcome specific enough to be measurable at the end of the trial period.
3. Enforce the criteria at the review, even if your feelings in the moment push differently.

Evidence

Pre-commitment and prospective decision-making research shows that decisions made in advance of emotional states are better calibrated than in-the-moment judgments. Sunk-cost effects are robust and addressable by pre-commitment to stopping rules. (observational)

The specific application to personal behavior experiments is practitioner-level guidance; the underlying sunk-cost and pre-commitment mechanisms are well documented.

Sources

• Arkes & Blumer (1985), the sunk cost effect, Organizational Behavior and Human Decision Processes

Common mistake

Setting exit criteria that are vague ("if it feels right") or that require only one type of outcome (continue or stop), missing the possibility of modifying and re-testing.