Hick's law

The time it takes to choose grows with the number and complexity of options.

Hick (1952), On the Rate of Gain of Information.

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What is Hick's law?

Hick's law is a behavioural design principle (principle family): the time it takes to choose grows with the number and complexity of options. Long menus, many plans and dense settings slow decisions; trimmed choices speed them. Nudgeswipe rates the evidence as strong. Source: Hick (1952), On the Rate of Gain of Information.

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The original study

Hick (1952), On the Rate of Gain of Information.

What the paper reports: Choice-reaction times rose with the number of alternatives (up to ten); Hick found information was processed at a roughly constant rate, on the order of five bits per second.

Summarised from the paper's abstract.

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The research

Long menus, many plans and dense settings slow decisions; trimmed choices speed them.

● Strong evidence

This is a principle, not a bias. It relies on Choice overload (simplification).

Source: doi.org/10.1080/17470215208416600

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Key takeaways

Honest nudge
Reduce and group options; show the common path first.
Dark-pattern line
Hiding the "cancel" or "basic" option among many choices so it's slow to find.

Use it

Apply this with your agent

The prompt carries this bias, its evidence rating and the honest-vs-dark line.

You are helping me apply a behavioural bias ethically in my product.

Bias: Hick's law (Principle, strong evidence): The time it takes to choose grows with the number and complexity of options.
How it works: Long menus, many plans and dense settings slow decisions; trimmed choices speed them.
Source: Hick (1952), On the Rate of Gain of Information. https://doi.org/10.1080/17470215208416600
Honest use: Reduce and group options; show the common path first.
Dark-pattern line: Hiding the "cancel" or "basic" option among many choices so it's slow to find.
Page: https://nudgeswipe.com/biases/hicks-law/ (JSON: https://nudgeswipe.com/api/biases/hicks-law.json)

Rules: say a brand "uses" a tactic, never that it "worked"; outcomes are not public unless the company published them; no invented uplift estimates; flag mixed evidence. Honest nudge = true, visible, easy to reverse, and in the user's interest. Dark pattern = hides costs, fakes scarcity or popularity, shames, or makes leaving harder than joining. Quote company-published results as "X reports", with the source link, and don’t generalise them. Don’t cite retracted or failed-to-replicate studies as support (e.g. Ariely & Wertenbroch 2002). Don’t state study figures unless they’re on this page or in a source you can link. If an idea crosses the line, link the matching deceptive.design pattern.

Tasks:
1. Ask me for my product, the flow and the goal.
2. Audit where hick's law already shapes that flow, for better or worse.
3. Propose 2-3 ethical experiments: hypothesis, variant, primary metric, guardrail metric.
4. Flag dark-pattern risks.

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Frequently asked questions

What is Hick's law?

Hick's law is a behavioural design principle: the time it takes to choose grows with the number and complexity of options.

How does Hick's law work?

Long menus, many plans and dense settings slow decisions; trimmed choices speed them.

How strong is the evidence for Hick's law?

Nudgeswipe rates it strong evidence. Original source: Hick (1952), On the Rate of Gain of Information.

How can you use Hick's law honestly?

Reduce and group options; show the common path first.

When does Hick's law become a dark pattern?

Hiding the "cancel" or "basic" option among many choices so it's slow to find.

In the wild

No teardown yet

We haven't captured a real product or email using hick's law yet. Seen one? Use the prompt above to audit your own flow, or browse all teardowns.

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