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CSCI 102 Intro to IT B
Autumn 2002
Introduction to HCI Lecturer
Gene Awyzio3.117
(02) 4221 [email protected]
Overview
• Designing for maximum usability is the goal of design
• History of interactive system design provides paradigms for usable designs
• Principles of usability are more general means of understanding usability
Introduction
• Concerns– How can an interactive system be
developed to ensure its usability?– How can the usability of an interactive
system be demonstrated or measured?
• Approaches– Paradigms for usability
• examples of successful interactive techniques
– Principles for usability• theoretically driven from psychological,
computational and sociological knowledge
Historical perspective on interactive system designHistorical perspective on interactive system design
• Time-sharing– 40s and 50s – explosive technological growth– 60s – need to channel the power
• J.C.R. Licklider at ARPA• single computer supporting multiple users• Video Display Units• more suitable medium than paper
– 1962 – Sutherland's Sketchpad– Computers for visualizing and manipulating data– One person's contribution could drastically change
the history of computing
• Time-sharing– 40s and 50s – explosive technological growth– 60s – need to channel the power
• J.C.R. Licklider at ARPA• single computer supporting multiple users• Video Display Units• more suitable medium than paper
– 1962 – Sutherland's Sketchpad– Computers for visualizing and manipulating data– One person's contribution could drastically change
the history of computing
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Principles to Support Usability
Principles to Support Usability
• A structured presentation of general principles to apply during design of an interactive system.
• Learnability– the ease with which new users can begin effective
interaction and achieve maximal performance
• Flexibility– the multiplicity of ways the user and system
exchange information
• Robustness– the level of support provided the user in determining
successful achievement and assessment of goal-directed behaviour
• A structured presentation of general principles to apply during design of an interactive system.
• Learnability– the ease with which new users can begin effective
interaction and achieve maximal performance
• Flexibility– the multiplicity of ways the user and system
exchange information
• Robustness– the level of support provided the user in determining
successful achievement and assessment of goal-directed behaviour
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Common Interface Design Mistakes
Common Interface Design Mistakes
• Controls. • Questions • Visual elements• Use of colour• Terminology• Error messages• Tabbed Dialogs• Metaphors• Globalisation
• Controls. • Questions • Visual elements• Use of colour• Terminology• Error messages• Tabbed Dialogs• Metaphors• Globalisation
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ControlsControls
• Controls represent the means by which the user communicates with the application
• The quality of the communication depends on two aspects of the controls: – The appropriateness of the control for the task – The consistency of the rules under which the control
operates.
• Select the wrong tool for the job, or change the rules under which the tool operates, and you will create problems for your users. Here are some examples...
• Controls represent the means by which the user communicates with the application
• The quality of the communication depends on two aspects of the controls: – The appropriateness of the control for the task – The consistency of the rules under which the control
operates.
• Select the wrong tool for the job, or change the rules under which the tool operates, and you will create problems for your users. Here are some examples...
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ControlsControls
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ControlsControls
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ControlsControls
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Questions/IntelligenceQuestions/Intelligence
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Questions/IntelligenceQuestions/Intelligence
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Visual ElementsVisual Elements
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Visual ElementsVisual Elements
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Visual ElementsVisual Elements
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Use of ColourUse of Colour
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Use of ColourUse of Colour
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TerminologyTerminology
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TerminologyTerminology
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TerminologyTerminology
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Error MessagesError Messages
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Error MessagesError Messages
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Tabbed DialogsTabbed Dialogs
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Tabbed DialogsTabbed Dialogs
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Tabbed DialogsTabbed Dialogs
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MetaphorsMetaphors
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MetaphorsMetaphors
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MetaphorsMetaphors
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GlobalisationGlobalisation
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GlobalisationGlobalisation
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