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Lindenberg, Neerincx Pemberton, Van Dijk CHI20001 Usability Techniques for Web-based Services Diversity and Technology.

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Presentation on theme: "Lindenberg, Neerincx Pemberton, Van Dijk CHI20001 Usability Techniques for Web-based Services Diversity and Technology."— Presentation transcript:

1 Lindenberg, Neerincx Pemberton, Van Dijk CHI20001 Usability Techniques for Web-based Services Diversity and Technology

2 Lindenberg, Neerincx Pemberton, Van Dijk CHI20002 Universal Accessibility Design for All

3 Lindenberg, Neerincx Pemberton, Van Dijk CHI20003 General Principles Vanderheiden (1997) Use: equitable, flexible, simple and intuitive. Perceptible information and error tolerance. Low physical effort and appropriate size and space for approach.

4 Lindenberg, Neerincx Pemberton, Van Dijk CHI20004 Guidelines for Elderly Czaja (1997) Contrast, screen glare, object size Minimal info, consistent location, group Highlight, color discrimination, key label Clear icons, practice Minimal demands on memory Consistency, simplicity (e.g. online help)

5 Lindenberg, Neerincx Pemberton, Van Dijk CHI20005 Web Content Guidelines (W3C) Auditory/visual alternatives/not color alone Markup and style sheets Natural language, tables, pages User control, access of embedded UIs Device independence, interim solutions W3C technologies, context information Clear navigation and simple documents

6 Lindenberg, Neerincx Pemberton, Van Dijk CHI20006 Conclusions Guidelines are available A coherent, complete, well-founded and practical set is lacking Techniques for application of the guidelines are scarce => Cognitive engineering framework

7 Lindenberg, Neerincx Pemberton, Van Dijk CHI20007 Cognitive Engineering (1) empirical summative analysis design empirical formative analytical formative Assessment Specification implemen- tation flow of spec/assesstask/processflow of iteration

8 Lindenberg, Neerincx Pemberton, Van Dijk CHI20008 practical theory effectiveness, efficiency and satisfaction objectives Web-service users, goals, info/ support needs and use context specification Cognitive Engineering (2) assessment data/ info task or process

9 Lindenberg, Neerincx Pemberton, Van Dijk CHI20009 Practical Cognitive Theory Factors that affect Web-navigation: Spatial ability for mental modeling Memory capacity for task-set switching Situation awareness during interaction

10 Lindenberg, Neerincx Pemberton, Van Dijk CHI Theoretical and Empirical Based User Requirements for Elderly

11 Lindenberg, Neerincx Pemberton, Van Dijk CHI Web-Navigation Performance

12 Lindenberg, Neerincx Pemberton, Van Dijk CHI Spatial Ability Mental rotation task => spatial representation

13 Lindenberg, Neerincx Pemberton, Van Dijk CHI Memory Capacity => scheduler and goal creation memory task

14 Lindenberg, Neerincx Pemberton, Van Dijk CHI News Products Introduction FacilitiesDepartments PeopleProjects Request for information Situation Awareness => multi-media, context and goal refinement categorise task

15 Lindenberg, Neerincx Pemberton, Van Dijk CHI Transform User Requirements into Navigation Support for Elderly

16 Lindenberg, Neerincx Pemberton, Van Dijk CHI Analysis Map user requirements on current support functions Prioritize according to “Web-service objectives” Estimate implementation costs => synthesize support concepts

17 Lindenberg, Neerincx Pemberton, Van Dijk CHI Design and Implementation Three support functions: categorizing landmarks history map navigation assistant

18 Lindenberg, Neerincx Pemberton, Van Dijk CHI Evaluation Three usability measures: effectiveness efficiency satisfaction

19 Lindenberg, Neerincx Pemberton, Van Dijk CHI Example Satisfaction Results

20 Lindenberg, Neerincx Pemberton, Van Dijk CHI Conclusions Individualization of Web-interfaces is needed to realize “Universal Accessibility” Design for all results in adaptive interfaces (no “boring uniformity”) Elderly users need more navigation support


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