Hick’s law
Also known as the diffusion of innovation, is a theory that states that the more choices a person has, the longer it will take them to make a decision. This theory can be applied to product design, as offering too many choices can lead to user confusion and frustration leading to bad customer experiences.
Overview
Hick's Law, formulated by psychologist William Edmund Hick in 1952, states that the time required to make a decision increases logarithmically with the number of choices available—more options require proportionally more time and cognitive effort to evaluate and decide. While the mathematical relationship involves logarithmic scaling (meaning decision time increases, but with diminishing increments for each additional choice), the practical insight is powerful: presenting too many options to users creates decision fatigue, increases choice paralysis, and leads to slower decisions or worse choices. In product design, Hick's Law informs navigation structure, menu organization, checkout flows, and feature presentation, guiding designers toward presenting essential options prominently while hiding less common choices, reducing cognitive load and improving user decision-making velocity.
Why is Hick's Law Valuable in UX Design?
Understanding Hick's Law helps designers create interfaces that feel responsive and easy to navigate rather than overwhelming, directly improving user satisfaction and decision-making speed. By limiting visible options to genuinely important choices and hiding secondary options behind menus or progressive disclosure, designs remain uncluttered while still providing full functionality to users who need it. Hick's Law explains a fundamental UX principle: fewer visible options typically lead to faster conversions, higher task completion rates, and lower user frustration—Amazon's streamlined checkout, Apple's minimal option sets, and Google's focused interfaces all embody Hick's Law principles. For e-commerce and SaaS products particularly, reducing choice complexity in critical flows like checkout or configuration dramatically improves conversion metrics and customer satisfaction.
When Should Hick's Law Guide Design Decisions?
Hick's Law principles are essential in specific design contexts:
Navigation and information architecture: When organizing site navigation or app menu structures, apply Hick's Law by limiting top-level navigation to 3-7 main categories, hiding secondary navigation under progressive disclosure rather than presenting all options simultaneously.
Checkout and conversion funnels: In e-commerce, SaaS onboarding, and signup flows where speed and completion matter, reduce choice overload by presenting essential options prominently, saving configuration preferences for post-completion settings rather than initial signup.
Product configuration and customization: For products with many customization options (software settings, product variants, service tiers), use progressive disclosure to present essential choices first, hiding advanced options behind expandable sections or settings pages.
Feature discovery and interface organization: When designing products with numerous features, organize interface space hierarchically to surface most-used features prominently while hiding advanced features behind menus, advanced tabs, or "more options" buttons, reducing cognitive load for typical users.
What Are the Drawbacks of Over-Applying Hick's Law?
While powerful, Hick's Law can be misapplied with negative consequences. Reducing choices to improve speed sometimes limits user autonomy—hiding legitimate options to streamline interfaces can frustrate power users and customers with genuine need for customization. Hick's Law describes decision time but not decision quality—sometimes additional information and options lead to better decisions even if they require more time, particularly in contexts where accuracy matters more than speed. Over-simplification in pursuit of Hick's Law compliance can feel patronizing or restrictive—users may feel constrained by hidden options or overly-simplified interfaces that don't acknowledge legitimate complexity. Additionally, the logarithmic relationship means diminishing returns kick in quickly—going from 5 options to 3 helps more than going from 100 to 98, yet designers sometimes remove genuinely useful options in pursuit of oversimplification.
Applying Hick's Law Thoughtfully
To leverage Hick's Law principles while avoiding oversimplification:
Distinguish between essential and secondary options: Analyze user workflows to identify which choices directly impact core tasks and which are secondary, presenting essential choices prominently while progressively disclosing secondary options rather than eliminating them entirely.
Use information architecture and progressive disclosure strategically: Employ menu structures, expandable sections, wizard flows, and conditional options to reduce visible choices at any moment while maintaining access to complete functionality for users who need it.
Test with target users across expertise levels: Validate whether your simplification actually improves user experience for your specific audience—novice users may benefit from reduced options while power users feel constrained, requiring layered interfaces that serve diverse needs.
Monitor metrics for decision speed and conversion: Measure whether reducing choice complexity actually improves desired metrics (checkout completion, task completion time, satisfaction) rather than assuming Hick's Law applies uniformly to all user populations and contexts.
Hick's Law provides a valuable framework for understanding choice complexity and improving user experience, most effective when applied thoughtfully to reduce unnecessary decision burden while preserving user autonomy and access to genuinely important options.