Framework · Behavioral science · Actionable Gamification

Hick's law, cognitive load and choice overload

Decision time rises with the number of equally likely options, and clutter burdens working memory. Choice overload is real only under specific conditions. One primary action per screen and 2-4 clearly different plans are good defaults. Hick A (simple tasks); load theory B; overload C.

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Plain label: fewer, clearer choicesAlso known as: Hick-Hyman law, cognitive load, choice overload, jam study, plan count

Core idea. Hick-Hyman: decision time grows roughly with the logarithm of the number of equally likely options, so making the likely option prominent helps even without removing others Evidence grade A. Robust evidence: replicated, peer-reviewed research.. Cognitive load theory: cut the extra load that comes from presentation Evidence grade B. Moderate evidence: solid studies with some limits.. F13 (Choice overload: a conceptual review and meta-analysis, Chernev, Bockenholt & Goodman, Journal of Consumer Psychology, 2015)

Choice overload. A 2010 meta-analysis of 50 experiments found a mean effect near zero with large variance; a 2015 meta-analysis found real effects once four moderators are present: complex option sets, hard decision tasks, unclear preferences and a goal of deciding quickly Evidence grade C. Limited evidence: few or small studies..

How it plugs in. One dominant action per key screen; progressive disclosure; a recommended option with a stated reason; pricing pages with 2-4 plans and one highlighted. Keep breadth for experts with clear preferences and good filters.

Limits

What we don’t claim

Octalysis is a practitioner framework built from observing games, not a validated scientific model.Actionable Gamification Ch.15, pp.399-400

Keep reading

Framework · Behavioral science
Choice architecture, defaults and sludge
honest defaults and friction audit
How choices are ordered, defaulted and framed shapes decisions; no layout is neutral. Defaults are the strongest single lever (moderate evidence, very variable), while nudges on average are small once publication bias is removed. Use honest defaults, all-in prices and a friction audit.
Framework · Behavioral scienceEvidence grade B. Moderate evidence: solid studies with some limits.
COM-B and the Behaviour Change Wheel
capability, opportunity and motivation diagnosis
A behavior needs capability, opportunity and motivation, and each gap points to different fixes. Use it as a completeness check when diagnosing why a step leaks, especially to catch opportunity problems mistaken for knowledge problems. Moderate evidence as a diagnostic (B), less as an outcome predictor.
Framework · Behavioral scienceEvidence grade B. Moderate evidence: solid studies with some limits.
Endowed progress effect
credit real progress already made
People persist more when a task looks already started. In the original car-wash field study, completion was 19% for a blank 8-stamp card versus 34% for a 10-stamp card with 2 stamps given. Credit only genuine actions. Moderate evidence (B), with few direct replications.
Framework · Behavioral science
Feedback interventions and gamification meta-analyses
what feedback and game layers really do
Feedback helps performance on average (d about 0.41), but over a third of feedback interventions made performance worse, mostly when feedback shifts attention from the task to the self. Game layers in learning show moderate gains (g about 0.25-0.49). Prefer task-focused feedback and near-peer comparisons. Feedback A; gamification B.
Framework · Behavioral science
Flow and the challenge-skill balance
difficulty that matches skill
Deep absorption comes with clear goals, immediate feedback and a perceived balance between challenge and skill. Too hard breeds anxiety; too easy breeds boredom. Use it to find boredom hotspots among veterans and anxiety hotspots among novices. Antecedents B; flow causing performance C.
Framework · Behavioral scienceEvidence grade C. Limited evidence: few or small studies.
Fogg Behavior Model (B = MAP)
motivation, ability and prompt model
A behavior happens when motivation, ability and a prompt meet at the same moment; when it fails, at least one is missing. Hooked calls the prompt a trigger (B = MAT). Use it to triage a drop-off step, working ability first. Evidence for the model as a whole is limited (grade C).

Sources

Actionable Gamification · Yu-kai Chou
Ch.11, p.293
Can there ever be too many options? A meta-analytic review of choice overload · Scheibehenne, Greifeneder and Todd, Journal of Consumer Research, 2010
Evidence grade C. Limited evidence: few or small studies.
Choice overload: a conceptual review and meta-analysis · Chernev, Bockenholt and Goodman, Journal of Consumer Psychology, 2015
Evidence grade C. Limited evidence: few or small studies.
Choice overload: a conceptual review and meta-analysis · Chernev, Bockenholt & Goodman, Journal of Consumer Psychology, 2015
Evidence grade C. Limited evidence: few or small studies.

Source IDs: F13GT#28

Book content is paraphrased, never quoted at length. Last verified October 24, 2026.

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What we don’t claim

Related

Choice architecture, defaults and sludge

COM-B and the Behaviour Change Wheel

Endowed progress effect

Feedback interventions and gamification meta-analyses

Flow and the challenge-skill balance

Fogg Behavior Model (B = MAP)

Sources

Find the stage your product is stuck in