Transcript Chapter 1 Introducing User Interface Design

Chapter 1
Introducing
User Interface Design
• Why the User Interface Matters
• Computers Are Ubiquitous
• The Importance of Good User
Interface Design
– What Is a Good User Interface Design?
• What Is Usability?
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Usability: (ISO 9241)
“the extent to which a product can be used by specified users to achieve
specified goals with effectiveness, efficiency and satisfaction in a
specified context of use.”
Effectiveness:
“the accuracy and completeness with which users can achieve goals in
particular environments”
Efficiency:
“the resources expended in relation to the accuracy and completeness of
the goals achieved”
Satisfaction”
“the comfort and acceptability of the work system to its users and other
people affected by its use”
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• The Problems of Poor or Bad User
Interfaces
– User Frustration and Dissatisfaction
– This is Broken, Ask Tog,
• Safety and the User Interface
• Elections and the User Interface
– Butterfly Ballot
– Small Irritations Are Also a Problem
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• Links:
Man Shoots Computer
Computer Rage
Computer Rage-2
Wikipedia Definition
Cartoon
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Designing for Users
• Human-Centered Design (HCD) Principles
– Active involvement of users
– Allocation of function between user and system
– Iteration of design solutions
– Multidisciplinary design teams
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Designing for Users
• 4 Essential HCD Activities
– Understand and specify the context of use
– Specify the user and organizational requirements
– Produce design solutions (prototypes)
– Evaluate designs with users against requirements
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• Designing for Users
– User-Centered Design
– The Classic Life Cycle
– Involving Users
• Who Are the Users?
– Making the Design Process Iterative
• When and How to Involve Users
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The Classic Life Cycle for Software Development
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Interface Design and Evaluation Process
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Stakeholders –vs- Users
• Stakeholders
– Payers, administration, developers, endusers
• Users
– Users of the computer system
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Star Life Cycle
• Evaluation-centered
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• The Two Types of Knowledge
Needed for UI Design
1.Information-gathering and analyses
that form part of the user interface
design and development process
2.User interface design knowledge (i.e.
design principles, design rules)
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Evaluation
– When and How Do You Evaluate?
• Evaluation Early in the Life Cycle
• Evaluation Later in the Life Cycle
• How Do You Evaluate?
– Observing the organization and how people work
– Interviewing, talking, and asking questions
– Making predictions
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