Fitts's, Hick's, Jakob's and Miller's laws: the UX laws that actually matter

Make important targets easy to reach.

The time required to reach a target is influenced by its size and distance. In UI design, important buttons should be large enough and placed where users can reach them comfortably. On mobile, this means considering thumb reach and touch-target size. On desktop, it means avoiding tiny controls for frequent actions.

Reduce unnecessary choices.

Decision time increases as the number and complexity of choices increase. This does not mean every menu should contain three items. It means the interface should distinguish between browsing and decision-making. Use grouping, search, filtering, defaults, and progressive disclosure when the option set becomes large.

Respect familiar mental models.

Users spend much of their time using other products. They therefore bring expectations about navigation, forms, search, carts, profiles, and settings. Innovation should improve the task rather than force users to relearn basic interaction patterns.

Manage working memory.

Miller's Law is often simplified to the famous “7±2” idea, but the more practical lesson is to reduce cognitive load through chunking and clear organization. Use sections, meaningful grouping, progressive disclosure, and visible context. Imagine a checkout screen: Fitts's Law helps place the primary action, Hick's Law reduces unnecessary choices, Jakob's Law makes the flow familiar, and Miller's Law keeps the information manageable. The real value of UX laws is that they work together as design lenses rather than isolated rules.