Rate subjective state on 1-5 or 0-10 scales at 3 fixed daily timepoints — consistent anchor descriptions across all measurement days prevent drift

Why This Is a Rule

Subjective measurements ("How focused am I right now?") are inherently noisy, but they can be made reliable enough for personal experimentation through two disciplines: simple scales and consistent anchors. A 1-5 scale forces a coarse but consistent classification (most people can reliably distinguish 5 levels). A 0-10 scale provides finer granularity for those comfortable with it. Scales above 10 points provide false precision — you can't reliably distinguish a 7 from an 8 on a 15-point scale.

Anchor descriptions prevent scale drift: without anchors, your internal calibration shifts day to day. A "4 out of 5" on Monday might mean "productive and focused" while on Friday it means "not terrible." Written anchors lock the scale: "1 = can't concentrate at all, 2 = frequently distracted, 3 = average focus, 4 = productively focused with occasional distractions, 5 = deep flow state." Now a 4 means the same thing on Monday and Friday, making cross-day comparison meaningful.

Three fixed daily timepoints (Measure at predetermined fixed times, not end-of-day retrospective — peak-end memory bias distorts retrospective self-assessment) provide enough data for day-level averaging while being lightweight enough to maintain consistently. More timepoints increase precision but decrease compliance.

When This Fires

• When designing any subjective measurement protocol for personal experiments
• When Five-step environmental experiment: baseline → hypothesis → single change → measure → compare — test one variable at a time for attributable results's experimental protocol needs a specific measurement tool
• When tracking subjective states (focus, energy, mood) across multiple days
• Complements Measure at predetermined fixed times, not end-of-day retrospective — peak-end memory bias distorts retrospective self-assessment (fixed-time measurement) with the specific scale and anchor requirements

Common Failure Mode

Unlabeled scales: "Rate your focus 1-10" without defining what each number means. Monday's 7 and Wednesday's 7 may represent different actual focus levels because the internal calibration shifted. Anchors prevent this drift by providing external reference points.

The Protocol

(1) Choose your scale: 1-5 (simpler, coarser) or 0-10 (finer, requires more discrimination). Use the same scale for the entire experiment. (2) Write anchor descriptions for at least 3 points on your scale (low, middle, high). For a 1-5 focus scale: "1 = can't focus, mind constantly wandering. 3 = normal focus, some distractions. 5 = deep flow, completely absorbed." (3) Keep the anchor descriptions visible during every measurement (taped to monitor, saved in phone note). Read them before rating — don't rely on memory of what the numbers mean. (4) Record at 3 fixed times daily (Measure at predetermined fixed times, not end-of-day retrospective — peak-end memory bias distorts retrospective self-assessment). Rate your current state, not your whole-day impression. (5) The measurement should take under 15 seconds: glance at anchors, assign number, record. If it takes longer, the scale is too complex or the anchors are too wordy.