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Usability

Usability. User interfaces Jaana Holvikivi Metropolia. 27.10.2013. Usability motivations. Why is ease-of-use/ usability an issue? Life-critical systems Control of power plants, nuclear power plants especially Air traffic control Airplanes and other vehicles Hospital and medical systems

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Usability

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  1. Usability User interfaces Jaana Holvikivi Metropolia 27.10.2013

  2. Usability motivations Why is ease-of-use/ usability an issue? • Life-critical systems • Control of power plants, nuclear power plants especially • Air traffic control • Airplanes and other vehicles • Hospital and medical systems • Requirements • Speed and accuracy of action • Good retention of learning

  3. Usability motivations • Frequently used systems • Banking • Corporate databases and intranets • Transportation tickets • Airline check-in • Mobile phones and other gadgets

  4. Usability goals • ISO 9241 standard: • Effectiveness, efficiency & satisfaction Measured by: • Time to learn • Speed of performance • Rate of errors by users • Retention over time • Subjective satisfaction

  5. Universal usability, needs • Variations in physical abilities, disabilities • Variations in use environment • Diverse cognitive abilities • Diverse perceptual abilities (vision, hearing) • Personality differences • Cultural and international diversity • Special user groups: children and the elderly

  6. Eight golden rules of interface design • Strive for consistency • Cater to universal usability • Offer informative feedback • Prevent errors • Design dialogs to yield closure • Permit easy reversal of actions • Support internal locus of control • Reduce short-term memory load

  7. Usability assessment of some systems

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