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Chapter 9: Design Guidance and Design Rationale

Chapter 9: Design Guidance and Design Rationale. Kevin Juang David Bate Will Rodes. Topics. Sources of Design Guidance Standards Guidelines Style guides Design Principles Simplicity Structure Consistency Tolerance Accessibility Design Rationale. Design Guidance.

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Chapter 9: Design Guidance and Design Rationale

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  1. Chapter 9: Design Guidance and Design Rationale Kevin Juang David Bate Will Rodes

  2. Topics • Sources of Design Guidance • Standards • Guidelines • Style guides • Design Principles • Simplicity • Structure • Consistency • Tolerance • Accessibility • Design Rationale

  3. Design Guidance • User Interface Standard • A set of internationally agreed design principles or approaches • Most common is ISO 9241 • Ergonomic requirements for office work with visual display terminals (VDTs) • Situations to use • Detailed starting point for development • Publicize its use • Client requires it

  4. Design Guidance • Design Guideline • Suggestion that is in between design principle and design rule in terms of detail

  5. Design Guidance • Style Guides • Collection of design rules and guidelines • Commercial or customized • Situations to use • Applied starting point for development • Target users already familiar • Associate with certain products

  6. Design Principles • Simplicity • Keep the interface natural to the users • Break down complex tasks into subtasks

  7. Design Principles • Structure • Group related features • Use metaphors

  8. Design Principles • Consistency • Leverage user’s mental model to aid learning and satisfaction • Can enforce using style guides or GUI code reuse

  9. Design Principles • Tolerance • Use constraints • Provide helpful error messages • Emphasize recoverability • Forward error recovery • Backward error recovery

  10. Accessibility • The Principles of Universal Design • W3C Web Content Accessibility Guidelines • Section 508

  11. Design Rationale • Record • Design decisions • Reasoning behind those decisions • Format • Table sorted by date • Brief text with illustrations when appropriate • Advantages • Record design thoughts for future reference • Communicate design decisions to others • Aids technical support and marketing

  12. Questions?

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