Don't Make Me Think
Steve Krug's first law of usability: a page should be self-evident, obvious, and self-explanatory so users can grasp it without conscious effort.
Also known as: Krug's First Law of Usability, Krug's Laws of Usability
Category: Principles
Tags: usability, user-experience, principles, cognitive-load, design, interfaces, simplicity
Explanation
"Don't Make Me Think" is the central usability principle articulated by Steve Krug in his book of the same name. It states that when a user looks at a web page, button, label, or link, its meaning and purpose should be instantly clear — no puzzling, parsing, or guesswork required. Every unit of cognitive effort the interface demands is friction that slows users down and pushes some of them to leave entirely.
**The Three Laws of Usability** (Krug):
1. **Don't make me think.** Make it obvious.
2. **It doesn't matter how many times I have to click, as long as each click is a mindless, unambiguous choice.**
3. **Get rid of half the words on each page, then get rid of half of what's left.**
**Why Thinking Is Expensive**:
- Users don't read pages — they scan them, looking for things that match their goal.
- Users don't make optimal choices — they satisfice, clicking the first reasonable option.
- Users don't figure out how things work — they muddle through, often using features incorrectly.
Every time a design forces a user to stop and think — "Is this clickable?", "What does this label mean?", "Where am I?", "Where do I start?" — the user loses momentum and confidence. Enough friction and they bounce.
**What Makes a Page Self-Evident**:
- **Clear visual hierarchy**: importance is signaled by size, color, and position.
- **Conventions over cleverness**: use patterns users already know (cart icon, underlined links, logo top-left links home).
- **Obvious clickability**: interactive elements look interactive.
- **Descriptive, unambiguous labels**: "Jobs" beats "Opportunities"; "Sign up" beats "Join the movement".
- **Clearly defined, walled-off areas**: the eye can parse sections at a glance.
- **Minimal noise**: every removed distraction makes the remaining content louder.
**How to Apply It**:
- Question every word, label, instruction, and feature: is it earning its place?
- Replace clever wording with plain language.
- Cut happy talk and instructions users won't read.
- Use familiar patterns instead of inventing novel ones.
- Test with real users (see the Trunk Test and guerrilla usability testing) — you'll be surprised what makes them stop and think.
The principle extends far beyond websites: it applies to any interface, document, form, or product. If people have to think about *how to use it* rather than *what they came to do*, the design has failed.
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