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A Well-Designed Thing Shows You What to Do: Clues in the Object, Not Instructions, Carry the Load

When a Simple Door Needs a Sign, the Design Has Failed: Five Clues Tell You How Anything Works

A Big Handle Says Pull, So a Door That Must Be Pushed Has Lied to You: Signifiers Steer Actions Faster Than Words

Door Doctor: Find the Missing Clue in Five Confusing Objects

Every Action Crosses Two Gulfs: Between Wanting and Doing, and Between Doing and Knowing It Worked

Seven Stages Turn a Goal Into a Result, and Design Fails Wherever a Stage Is Hard to Cross

A Rope Bridge With Missing Planks Shows Why Capable People Fall Into the Gap: The Fault Is in the Design

Cross the Gulf: Find Where the Bridge Between Wanting and Getting Broke

Behavior Can Be Precise Without Precise Knowledge: The World Holds Most of What the Head Needs

People Need Far Less in Their Heads Than They Think, Because Recognizing Is Easier Than Recalling

Knobs That Mirror Their Burners Need No Memory: Natural Mapping Lets the World Do the Remembering

Memory Lab: How Little You Need in Your Head When the World Holds the Clues

Good Design Makes the Wrong Move Hard: Four Constraints and Three Forcing Functions Narrow the Choices

Constraints Shrink the Options Until Only the Right Move Is Left, So Fewer Instructions Are Needed

A Plug That Fits One Way Turns the Right Move Into the Only Move

Only One Way In: Let Constraints Shrink the Choices Until Only the Right Move Is Left

Blaming the Person Hides the Fault: Errors Are Signals About Design, and Design Can Make Them Rare, Visible and Reversible

Most Human Error Is a Design Failure: Slips Come From Attention and Mistakes From Wrong Plans, So Each Needs a Different Cure

Five Slices of Cheese in a Row: An Accident Needs Every Hole to Line Up, So Each Extra Layer Makes It Rarer

Case Files: Slip, Mistake, or a Design That Set the Trap

Design Is a Process of Finding the Right Problem First: Watch People, Prototype Cheaply, and Resist Adding Features

Two Diamonds Find the Right Problem First and the Right Solution Second, and Each Opens Wide Before It Narrows

Two Diamonds on a Drafting Table: Find the Right Problem, Then the Right Solution, and Test Both Cheaply

Find the Real Problem: Walk Two Diamonds From a Symptom to a Tested Fix

Check Your Understanding

Why a Big Handle on a Door That Must Be Pushed Is the Design's Fault and Not the Person's

What the Gulf of Evaluation Means When a Device Acts and Then Says Nothing

Why Retraining Alone Does Not Fix a Wrong-Drug Error Caused by Look-Alike Vials

Go Further

The Full Story Behind These Ideas, From the Stuck Door to a Way of Designing for Real People

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Almost everyone has pulled a door that needed a push and felt a flash of embarrassment. This course teaches the opposite reading, drawn from decades of research on how people use everyday objects: that the fault usually sits in the design, and that a well-made thing tells you what to do without a sign.

The Design of Everyday Things — how good design shows you what to do, and why the fault is rarely yours

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