Rule 26 of 29 · Chapter VI — The Discipline of Restraint
Remove before you add
Why this rule exists
The reflex, when a design is not working, is to add: another label to explain, another button for the missing option, another line to separate, another feature to satisfy the request. Addition feels like progress because it is visible and generous, and it is usually the wrong move. Most interfaces suffer not from too little but from too much, and the fix for a cluttered, confusing screen is more often subtraction than addition. Every element you add competes with every other for the user's attention, so adding one thing quietly weakens everything already there. Removing, by contrast, gives the survivors room and clarity, and a screen with less on it is not a poorer screen but a calmer, more usable one. Restraint is harder than generosity because it means saying no, cutting the feature, deleting the explanation, trusting the user, but the strongest designs are defined as much by what they leave out as by what they include. When in doubt, take something away.
The full rule lives in the book
How to apply it, worked examples, and when it doesn't apply are part of The Thoughtful Designer, a premium rule book.
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