IMSE_CIS577_Lec3_1.ppt (1) - IMSE/CIS577- User Interface...

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Lecture 3-1: Guidelines, Principles, and Theories Chapter 2 IMSE/CIS577- User Interface Design & Analysis Winter 2011 1-2 Guidelines Shared language Best practices Critics Too specific, incomplete, hard to apply, and sometimes wrong Proponents Encapsulate experience 2 1-3 Navigating the interface Sample of the National Cancer Institutes guidelines: Standardize task sequences Ensure that embedded links are descriptive Use unique and descriptive headings Use check boxes for binary choices Develop pages that will print properly Use thumbnail images to preview larger images 3 1-4 Accessibility guidelines Provide a text equivalent for every nontext element For any time-based multimedia presentation synchronize equivalent alternatives Information conveyed with color should also be conveyed without it Title each frame to facilitate identification and navigation 4
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1-5 Organizing the display Smith and Mosier (1986) offer five high- level goals Consistency of data display Efficient information assimilation by the user Minimal memory load on the user Compatibility of data display with data entry Flexibility for user control of data display 5 1-6 Getting the user’s attention Intensity Marking Size Choice of fonts Inverse video Blinking Color Audio 6 1-7 Principles More fundamental, widely applicable, and enduring than guidelines Need more clarification Fundamental principles Determine user’s skill levels Identify the tasks Five primary interaction styles Eight golden rules of interface design Prevent errors Automation and human control 7 1-8 Determine user’s skill levels l Know thy user” Age, gender, physical and cognitive abilities, education, cultural or ethnic background, training, motivation, goals and personality Design goals based on skill level Novice or first-time users Knowledgeable intermittent users Expert frequent users Multi-layer designs 8
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1-9 Identify the tasks Task Analysis usually involve long hours observing and interviewing users Decomposition of high level tasks Relative task frequencies 1-10 Choose an interaction style Direct Manipulation Menu selection Form fillin Command language Natural language 1-11 Spectrum of Directness 1-12 The 8 golden rules of interface design 1. Strive for consistency 2. Cater to universal usability 3. Offer informative feedback
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IMSE_CIS577_Lec3_1.ppt (1) - IMSE/CIS577- User Interface...

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