The Design of Everyday Things

#design #affordances #conceptual-models #usability #human-centered-design #psychology-of-everyday-things

The Design of Everyday Things

Author: Donald A. Norman
Year: 1990 (paperback edition; originally published 1988 as The Psychology of Everyday Things)
Source type: book
Raw file: raw/books/norman-1990-design-of-everyday-things.md

Summary

Donald Norman's The Design of Everyday Things is a foundational text in human-centered design and cognitive engineering. Norman argues that the frustrations people experience with everyday objects—doors, faucets, light switches, appliances—are not due to user incompetence but to faulty design that violates basic psychological principles. The book introduces key concepts including affordances, conceptual models, visibility, natural mapping, and feedback as essential design principles. Norman's central thesis is that good design makes the operation of objects obvious through visible clues and natural relationships between controls and functions, while bad design forces users to rely on arbitrary instructions, labels, and trial-and-error. The book examines how people form mental models of device operation, the gulfs of execution and evaluation that separate intention from action, and how knowledge is distributed between the head and the world.

Key Claims

Bad design predominates: "Alas, poor design predominates. The result is a world filled with frustration, with objects that cannot be understood, with devices that lead to error."
Users blame themselves, not design: When people cannot use simple everyday objects, they blame their own "mechanical ineptitude" rather than recognizing the design fault. This creates a "conspiracy of silence" maintaining feelings of guilt and helplessness.
Affordances provide natural clues: "When affordances are taken advantage of, the user knows what to do just by looking: no picture, label, or instruction is required. Complex things may require explanation, but simple things should not."
Two fundamental design principles: "(1) provide a good conceptual model and (2) make things visible."
False conceptual models cause frustration: Norman's refrigerator example shows how manufacturers provide wrong conceptual models (two controls suggesting independent temperature control when there is only one thermostat), making proper adjustment "almost impossible and always frustrating."
Visibility is the most violated principle: "The problems caused by inadequate attention to visibility are all neatly demonstrated with one simple appliance: the modern telephone."
Natural mapping reduces cognitive load: "Natural mapping, by which I mean taking advantage of physical analogies and cultural standards, leads to immediate understanding."
The paradox of technology: "The development of a technology tends to follow a U-shaped curve of complexity: starting high; dropping to a low, comfortable level; then climbing again... The same technology that simplifies life by providing more functions in each device also complicates life by making the device harder to learn, harder to use."
Knowledge is distributed: "Not all of the knowledge required for precise behavior has to be in the head. It can be distributed—partly in the head, partly in the world, and partly in the constraints of the world."
Learned helplessness from bad design: "The design of everyday things (and the design of mathematics courses) seems almost guaranteed to cause this. We could call this phenomenon taught helplessness."
The seven stages of action: All action involves: (1) forming the goal, (2) forming the intention, (3) specifying an action, (4) executing the action, (5) perceiving the state of the world, (6) interpreting the state of the world, (7) evaluating the outcome.
Gulfs of Execution and Evaluation: Design must bridge the gulf between intentions and allowable actions (Execution) and between physical state and interpretation (Evaluation).
Designers must assume all errors will occur: "If an error is possible, someone will make it. The designer must assume that all possible errors will occur and design so as to minimize the chance of the error in the first place, or its effects once it gets made."

Connections

Concepts: affordances, conceptual models, visibility, mapping, feedback, knowledge, constraints, learned helplessness, everyday life, embodiment, thing ontology

Authors: donald norman

Debates: theory of the everyday, everyday vs iconic architecture

Direct Quotes

"The human mind is exquisitely tailored to make sense of the world. Give it the slightest clue and off it goes, providing explanation, rationalization, understanding. Consider the objects—books, radios, kitchen appliances, office machines, and light switches—that make up our everyday lives. Well-designed objects are easy to interpret and understand. They contain visible clues to their operation. Poorly designed objects can be difficult and frustrating to use. They provide no clues—or sometimes false clues. They trap the user and thwart the normal process of interpretation and understanding." (p. 2)

"When affordances are taken advantage of, the user knows what to do just by looking: no picture, label, or instruction is required. Complex things may require explanation, but simple things should not. When simple things need pictures, labels, or instructions, the design has failed." (p. 9)

"The correct parts must be visible, and they must convey the correct message... I call the use of natural signals natural design." (p. 4)

"A good conceptual model allows us to predict the effects of our actions. Without a good model we operate by rote, blindly; we do operations as we were told to do them; we can't fully appreciate why, what effects to expect, or what to do if things go wrong." (p. 12-13)

"The paradox of technology: added functionality generally comes along at the price of added complexity... The same technology that simplifies life by providing more functions in each device also complicates life by making the device harder to learn, harder to use. This is the paradox of technology." (p. 20-21)

"Not all of the knowledge required for precise behavior has to be in the head. It can be distributed—partly in the head, partly in the world, and partly in the constraints of the world." (p. 35)

"If an error is possible, someone will make it. The designer must assume that all possible errors will occur and design so as to minimize the chance of the error in the first place, or its effects once it gets made. Errors should be easy to detect, they should have minimal consequences, and, if possible, their effects should be reversible." (p. 28)

"The design of everyday things seems almost guaranteed to cause this. We could call this phenomenon taught helplessness." (p. 31)

"Natural mapping, by which I mean taking advantage of physical analogies and cultural standards, leads to immediate understanding." (p. 18)

"There are an amazing number of everyday things, perhaps twenty thousand of them... Suppose that each everyday thing takes only one minute to learn; learning 20,000 of them occupies 20,000 minutes—333 hours or about 8 forty-hour work weeks." (p. 10)

Open Questions

How does Norman's cognitive/functionalist account of the everyday relate to the phenomenological account (Heidegger, Merleau-Ponty, Pallasmaa) in this wiki?
Does Norman's focus on individual objects miss the collective/social dimension of the everyday emphasized by de Certeau, Lefebvre, and Bourdieu?
How would Norman's principles apply to architecture specifically, not just consumer products?
What is the relationship between Norman's "affordances" and the ecological psychology of J.J. Gibson (who coined the term)?
How does the "taught helplessness" Norman describes relate to the ideological functions of architecture (Tafuri, Spencer)?