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20 Cards in this Set
- Front
- Back
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Design principals can be used to guide design decisions. They also can be used to determine if there exists gulfs of ____ or ____. |
Execution or evaluation. |
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What is the gulf of execution? |
It relates to the effectiveness principal. |
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What is the gulf of evaluation? |
It relates to the efficiency principal. |
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The framework for design principals: |
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The framework for design principles has two main goals. What are they? |
Comprehensibility and learnability. |
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What are the two categories in the design principles? |
Efficiency principles and effectiveness principles. |
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What is functionality in this image? |
The system must have adequate functionality for a task. |
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What is the presentation filter in this image? |
The functionality must be made accessible through the interface. |
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What is the comprehensibility barrier in this image? |
Will be passed when the presentation is understandable. |
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What is the learnability barrier in this image? |
Will be passed if the interface is comprehensible. |
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What are the principles of Effectiveness/Usefulness? |
Flexibility, Utility, Safety, Stability. |
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What are the principles of Efficiency/Usability? |
Memorability, Simplicity, Predictability, Visibility. |
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What is the effectiveness goal? |
The effectiveness goal stipulates that a design must fulfill the users needs by affording required functionality. |
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What is the efficiency goal? |
The efficiency goal stipulates that a design should allow a user to accomplish tasks in a quick, easy way without doing complex/extra procedures. |
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What is Ockhams razor? |
Pluralities should be used only when necessary. |
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What is the 80/20 rule. |
80% of the usage comes from 20% of the functionality. |
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What is statisficing? |
Statisficing is the conflicting need of finding the best solution and the need to settle to proceed with the design. |
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What is progressive disclosure? |
Show the user only what is necessary and give them more information when necessary. |
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What are the physical areas of constraints? |
Paths - constrain movement to a designated location and direction.
Axes - constrain the users movement to rotation around an axis.
Barrier - provide spatial constraints that can confine the user's movement to the approriate areas of the interface. |
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What are psychological areas of constraints? |
Conventions - exploit learned behaviour to influence a users actions.
Mapping - can influence the way in which people perceive relationship between controls and effects.
Symbols - can influence the way in which we interact with an interface by defining meaning and constraining our possible interpretations of interface elements. |
