What is Hick's law in UX design?
Hick's law states that the time it takes a person to make a decision increases logarithmically with the number of choices available. Named after psychologists William Edmund Hick and Ray Hyman who demonstrated the relationship in 1952, it is one of the most directly applicable principles in interaction design.
In practical terms: every additional option in a menu, every extra button on a screen, every additional filter in a search interface slows users down. The more choices users face, the higher the probability they make no choice at all.
Why does Hick's law matter for interface design?
Hick's law is especially critical at high-stakes moments in a user flow: primary navigation, onboarding decisions, checkout steps, and call-to-action placement. At these moments, hesitation costs conversion. Reducing the number of visible options at any given point reduces cognitive load and accelerates decision-making without removing functionality.
How to apply Hick's law in UX design
Use progressive disclosure to show fewer options upfront and reveal additional choices when users actively seek them. Limit primary navigation to the options users need most frequently. Use a clear visual affordance hierarchy so the most important action is immediately obvious. When presenting multiple options, group and categorize them so users can eliminate categories quickly rather than evaluating every item individually.
What is the difference between Hick's law and Fitts's law?
Hick's law concerns the time it takes to choose between options: fewer choices means faster decisions. Fitts's law concerns the time it takes to physically reach and interact with a target: larger and closer targets are faster to hit. Both laws address speed of interaction but at different levels: Hick's law at the decision level, Fitts's law at the motor level.