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MethodWriting template

How to write up an experiment that didn't work

A reusable structure for negative results: preserve the hypothesis, the evidence, and what you would try next.

Writing template. This is a guide for a future experiment log. It does not report an experiment or measured result.

Question and expectation

State the question and explain why the approach seemed plausible. Write the expected observation before introducing the actual outcome.

Describe the conditions under which the hypothesis would be supported, weakened, or left unresolved.

Setup and evidence

Record the task, baseline, controlled variables, evaluation procedure, and the code revision. Separate what was measured from what you think it means.

Part of the noteWhat to record
HypothesisThe claim being tested
InterventionWhat changed from the baseline
ObservationMeasurements and relevant artifacts
InterpretationPossible explanations and uncertainty
Next stepA discriminating follow-up experiment

Include traces or qualitative examples when they help explain what the summary metric misses.

What the failure does and does not establish

An unsuccessful run does not by itself explain the failure. Distinguish a problem with the idea from a problem with the implementation, evaluation, or experimental setup.

Keep alternative explanations visible. If they haven’t been tested, describe them as possibilities.

The next useful question

End with the smallest follow-up that would resolve an uncertainty. A negative result becomes more useful when the reader can see exactly what it changes about the next decision.

The notebook continues.

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