1. The paradox of technology
1.1. U-shaped curve of complexity
1.1.1. Starting high
1.1.1.1. New products, complex hard to learn
1.1.2. Dropping to a low, comfortable level
1.1.2.1. Technicians become become more competent etc. + Reliability, + Powerful
1.1.3. Climbing again
1.1.3.1. Newcomers, more ways to add: Capabilities, power. At the expence of added complexity, sometimes decreased reliability.
2. Conceptual models
2.1. Comes from their visible structure
2.1.1. Affordances
2.1.2. Constrains
2.1.3. Mappings
2.2. Scissors
2.2.1. Affordances
2.2.1.1. The holes
2.2.2. Constraings
2.2.2.1. The size of the holes
2.2.3. Mappings
2.2.3.1. The set of possible operations, suggested and constrained by the holes
3. Principles of design
3.1. Visibility
3.1.1. Natural Design
3.1.1.1. Natural interpreted
3.1.1.2. Natural signs
3.2. Affordances
3.2.1. The difference between the perceived use of the device and the actual use of the device
4. The principles of mapping
4.1. Controls and displays exploit natural mappings.
4.2. Close relation between the control and its function.
5. Fundemental principles of designing for people
5.1. Provide a good conceptual design
5.1.1. Mental models
5.1.2. System image
5.2. Make things visible
5.2.1. Location
5.2.2. Mode of operation
6. The principle of Feedback
6.1. Feedback to the user
6.1.1. Sounds, tones
6.1.2. Imaging, displays, lights