Chapter 1 Introducing User Interface Design

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Chapter 1IntroducingUser Interface Design
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• 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 Satisfacti
on 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
• Information-gathering and analyses that form part
  of the user interface design and development
  process
• 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