Design Rules for Maximum Usability: Principles, Standards, and Guidelines, Slides of Human Resource Management

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chapter 7

design rules

design rules

Designing for maximum usability

• the goal of interaction design
• Principles of usability
• general understanding
• Standards and guidelines
• direction for design
• Design patterns
• capture and reuse design knowledge

Principles to support usability

Learnability

the ease with which new users can begin effective interaction and achieve maximal performance

Flexibility

the multiplicity of ways the user and system exchange information

Robustness

the level of support provided the user in determining successful achievement and assessment of goal- directed behaviour

Principles of learnability

Predictability

• determining effect of future actions based on

past interaction history

• operation visibility

Synthesizability

• assessing the effect of past actions
• immediate vs. eventual honesty

Principles of flexibility

Dialogue initiative

• freedom from system imposed constraints on input dialogue
• system vs. user pre-emptiveness

Multithreading

• ability of system to support user interaction for more than one task at a time
• concurrent vs. interleaving; multimodality

Task migratability

• passing responsibility for task execution between user and system

Principles of flexibility (ctd)

Substitutivity

• allowing equivalent values of input and

output to be substituted for each other

• representation multiplicity; equal opportunity

Customizability

• modifiability of the user interface by user

(adaptability) or system (adaptivity)

Principles of robustness (ctd)

Responsiveness

• how the user perceives the rate of

communication with the system

• Stability

Task conformance

• degree to which system services support all

of the user's tasks

• task completeness; task adequacy