Hick's Law
The time to make a decision increases logarithmically with the number of choices. The foundation for navigation design and choice architecture.
What is it?
Hick's Law (formally Hick-Hyman Law) states that the time it takes to make a decision increases with the number and complexity of choices. Formulated by British psychologist William Edmund Hick in 1952, it shows that doubling the number of options does not double decision time — the relationship is logarithmic. But in practice, more choices always means longer decisions and more anxiety.
Why it matters
Every navigation menu, settings page, feature list, and onboarding flow is a test of Hick's Law. Products that give users too many choices at any single decision point create hesitation, decision paralysis, and abandonment. Simplifying choices is not dumbing down — it's respecting cognitive cost.
Best Practices
- Limit primary navigation to 5–7 items. Users can hold ~7 items in working memory (Miller's Law intersects here).
- Use progressive disclosure: show basic options first, reveal advanced options on demand.
- Curate, don't list. Show users the best 3 options, not all 30.
- Use smart defaults so users don't have to choose at all for common cases.
- Categorize and group choices to reduce the effective number of decisions.
- For onboarding, break choices across multiple steps instead of presenting everything at once.
- Eliminate redundant options. If two choices produce the same outcome, remove one.
- For product tiers, 3 options is the sweet spot (Good/Better/Best). More than 4 causes paralysis.
- Highlight a recommended option to short-circuit decision-making for users who don't know what to choose.
- Use "most popular" labels to guide decision-making through social proof.
Common Mistakes
- Navigation menus with 15+ items — every item above 7 decreases effective usability.
- Pricing pages with 5+ tiers — users default to the cheapest or close the page.
- Feature lists without prioritization — 30 features presented equally is 30 choices.
- Settings pages with every option exposed simultaneously.
- Onboarding that asks 15 questions on one screen.
- Product selection pages without filters or recommendations.
Checklist
Research & Theory
Hick's Original Study (1952)
William Edmund Hick demonstrated that reaction time increases logarithmically with the number of choices presented. RT = a + b log₂(n + 1).
Why it's relevant
The logarithmic relationship means: 2 choices → some cost. 4 choices → slightly more. 16 choices → significantly more. 100 choices → prohibitive.
Paradox of Choice (Schwartz, 2004)
Barry Schwartz extended Hick's principles: too many choices reduces satisfaction even after a decision is made. More options → more regret about unchosen alternatives.
Why it's relevant
Even when users make a choice, too many options create post-decision regret that erodes satisfaction with the chosen option.
Jam Study (Iyengar & Lepper, 2000)
When a grocery store offered 24 jams, 3% of customers bought. When 6 were offered, 30% bought. 10× more conversions with fewer options.
Why it's relevant
The most famous real-world demonstration of Hick's Law. Directly applicable to e-commerce product curation.
Real-World Examples
Netflix
"Top 10" and "Because you watched X" reduce the 10,000+ option catalog to manageable choices. The hardest UX problem Netflix solves is Hick's Law at scale.
Linear
Three pricing tiers. One highlighted as "Most popular." Pricing page is solved in one glance.
Apple
One laptop. One desktop. One phone at each price point. The product lineup is itself a Hick's Law solution.