Chapter 4 is giving us a lot of details for example if we encounter a novel object, how can we tell what to do with it? Either we have dealt with something similar in the past and transfer old knowledge to the new object, or we obtain instruction. In these cases the information we need is in the head. Another approach is to use information in the world, particularly if the design of the new object has presented us with information that can be interpreted.
Using Constraints
- Physical constraints: Physical limitations constrain possible operations. Physical constraints are made more effective and useful if they are easy to see and interpret, for then the set of actions is restricted before anything has been done.
- Semantic constraints: Semantic constraints rely upon the meaning of the situation to control the set of possible actions. They rely upon our knowledge of the situation and the world.
- Cultural constraints: Some constraints rely upon accepted cultural conventions, even if they do not affect the physical or semantic operation of the device.
- Logical constraints: Natural mappings work by providing logical constraints.
Make relevant parts visible and give each action an immediate and obvious effect. Some suggestions include making visible the invisible and using sound for feedback.
Chapter 5 is talking about slips and the types of slips.
- Capture errors
- Description errors
- Data-Driven errors
- Associative activation errors
- Mode errors
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