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Usability Models

Usability Models. the authors compare three usability models and introduce their own “the extent to which a product can be used to achieve specific goals with effectiveness, efficiency and satisfaction.”

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Usability Models

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  1. Usability Models • the authors compare three usability models and introduce their own • “the extent to which a product can be used to achieve specific goals with effectiveness, efficiency and satisfaction.” • usability is one measure of success within software engineering that might also include: functionality, cost, maintainability. • each characteristic must be measurable. Measures can be quantitative or qualitative and subjective or objective. Opinions of experts can also be used. • collectively, used to measure the usability of an existing system or iteratively during the development of a new system • additional areas of usability • documentation • installation • support • maintenance

  2. User Interface Characteristics • Ease of learning - amount of time to become proficient • Ease of use - efficiency after becoming proficient • Ease of relearning - amount of time to learn a second time • Task match - the extent to which the system features match the user needs • Flexibility - ability to support unanticipated usage patterns • Satisfaction - from the user’s perspective

  3. Key Factors that Influence Usability • Place usability into context • Tasks • frequency - how often is the task performed • rigidness - how many options / alternatives available to complete the task • situational - security, collaboration, environment • User • expertise - novice, occasional or expert (power) • motivation - high or low

  4. Group Activity • Identify appropriate characteristics and measurements for using Banner to register for Winter courses. • Identify key factors for tasks and users • Identify standard tasks, representative tasks, benchmark tasks.

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