CHAPTER 3: THE SEVEN STAGES OF ACTION

The Nature Of Human Thought And Explanation. 

*people making decisions at the time, the sequence of events is quite natural.

The Seven Stages Of Action And The Levels Processing.

*Basic Idea:

• GOAL - knowing what we want to achieve
• EXECUTION -the action that can be achieve the goal
• EVALUATION - the goal that have made

*Forming a goal

example: I want more light so I can see better.

*Forming the intention

example: I will turn on some lights.

*Specifying an action

example: I will walk to the walk and move the light switch up.

*Executing the action

example: Attempting to do the action.

*Perceiving the state of the world

example: I look around.

*Interpreting the state of the world

example: Can I see better?

*Evaluating the outcome

example: If I can see better, I have succeeded!

The Gulf of Execution

• the intention is not following by the action.
• the user does not know how to use it when looking the design.

The Gulf of Evaluation

• reflects the amount of effort that the person must exert to interpret the physical state of the system.
• to determine how well the expectations and intentions have been met.

Seven Fundamental Design Principles.

1. Visibility or Discover-ability

• the device and the alternatives for action

2. Feedback

• the users receives full and continuous feedback about the results of actions.

3. Conceptual Model

• good model or not complex design

4. Affordance

• the design suitable or not with their function

5. Signifiers

• usable

6. Constraints

•  the lack in the design

7. Mapping

• relations between actions and result