What does it mean that record experimental results?

Keep a log of what you tried and what happened for future reference.

Example: You decide to test whether a twenty-minute walk before your afternoon work block improves your focus. You run the experiment for a week, and it seems to help — but you do not write anything down. Three months later, facing another afternoon focus slump, you vaguely remember trying walking once but cannot recall the specifics: Was it twenty minutes or thirty? Before lunch or after? Did it help on all five days or just the two you remember most clearly? You either re-run the identical experiment — wasting a week rediscovering what you already learned — or you skip it because your fuzzy memory says "I think I tried that and it was fine but I stopped for some reason." Compare this with a colleague who kept a simple experiment log: "Week of March 3, 20-minute walk at 1:15 PM before deep work block. Day 1: focus felt sharper, completed two extra Pomodoros. Day 2: raining, walked in building stairwell, marginal effect. Day 3: strong effect again, noticed energy was higher too. Day 4: skipped walk due to meeting, focus collapsed by 2:30. Day 5: walked 25 minutes, diminishing returns past 20. Verdict: 20-minute outdoor walk reliably boosts afternoon focus; indoor substitute is weak. Next experiment: test whether 10 minutes of outdoor walking captures 80% of the benefit." Six months later, this colleague does not need to re-run the experiment. The record is there — precise, timestamped, with observations their memory would have distorted or lost entirely.

Try this: Select one behavioral experiment you are currently running or have recently completed. If you have none, design one using the protocol from L-1103 and run it for a minimum of three days before completing this exercise. Create an experiment log entry using the six-field format described in this lesson. Field 1 — Hypothesis: State what you predicted would happen, written before you see results. Field 2 — Intervention: Document exactly what you did, with enough specificity that you could replicate it six months from now. Include timing, duration, context, and any deviations from your original plan. Field 3 — Observable Data: Record what you actually observed, separating objective measurements from subjective impressions. Note at least one thing you did not expect. Field 4 — Outcome Assessment: State whether the hypothesis was supported, partially supported, or unsupported. Resist the urge to rationalize a clean narrative — flag ambiguity where it exists. Field 5 — Surprises and Side Effects: Document anything you noticed that was not part of your original hypothesis. These peripheral observations often become the seeds of your most valuable future experiments. Field 6 — Next Steps: Based on this result, what will you try next? Write at least one specific follow-up experiment with a concrete start date. After completing the entry, review it and notice: how much of what you recorded would you have remembered accurately in three months without writing it down?