Decide how you are going to measure your results

When designing behavioural experiments do think carefully about how you are going to measure your results. Are there any objective benchmarks that will help you evaluate what has happened? If you rely on feelings or subjective impressions alone you may be in trouble: thinking errors such as filtering, exaggeration and polarised thinking could blunt your objectivity. Sometimes it can be helpful to recruit someone else to help you evaluate outcomes or at least develop firm criteria to which you can rate the outcome of your experiment.

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