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Chapter 1Chapter 1
IntroducingIntroducingUser Interface DesignUser Interface Design
UIDE Chapter 1UIDE Chapter 1
•Why the User Interface MattersWhy the User Interface Matters
•Computers Are UbiquitousComputers Are Ubiquitous
•The Importance of Good User The Importance of Good User Interface DesignInterface Design
– What Is a Good User Interface Design?What Is a Good User Interface Design?
•What Is Usability?What Is Usability?
UIDE Chapter 1UIDE Chapter 1
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”
UIDE Chapter 1UIDE Chapter 1
• The Problems of Poor or Bad The Problems of Poor or Bad User InterfacesUser Interfaces
– User Frustration and DissatisfactionUser Frustration and Dissatisfaction
– This is Broken, Ask Tog,This is Broken, Ask Tog,
• Safety and the User InterfaceSafety and the User Interface
• Elections and the User InterfaceElections and the User Interface
– Butterfly BallotButterfly Ballot
– Small Irritations Are Also a ProblemSmall Irritations Are Also a Problem
UIDE Chapter 1UIDE Chapter 1
• Links:Links:
Man Shoots ComputerMan Shoots Computer
Computer RageComputer Rage
Computer Rage-2Computer Rage-2
Wikipedia DefinitionWikipedia Definition
CartoonCartoon
UIDE Chapter 1UIDE Chapter 1
Designing for UsersDesigning for Users
• Human-Centered Design (HCD) PrinciplesHuman-Centered Design (HCD) Principles– Active involvement of usersActive involvement of users– Allocation of function between user and Allocation of function between user and
systemsystem– Iteration of design solutionsIteration of design solutions– Multidisciplinary design teamsMultidisciplinary design teams
UIDE Chapter 1UIDE Chapter 1
• 4 Essential HCD Activities4 Essential HCD Activities– Understand and specify the context of useUnderstand and specify the context of use– Specify the user and organizational Specify the user and organizational
requirementsrequirements– Produce design solutions (prototypes)Produce design solutions (prototypes)– Evaluate designs with users against Evaluate designs with users against
requirementsrequirements
Designing for UsersDesigning for Users
UIDE Chapter 1UIDE Chapter 1
•Designing for UsersDesigning for Users
– User-Centered DesignUser-Centered Design
– The Classic Life CycleThe Classic Life Cycle
– Involving UsersInvolving Users
•Who Are the Users?Who Are the Users?
– Making the Design Process IterativeMaking the Design Process Iterative
•When and How to Involve UsersWhen and How to Involve Users
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The Classic Life Cycle for Software Development
UIDE Chapter 1UIDE Chapter 1
Interface Design and Evaluation Interface Design and Evaluation ProcessProcess
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Stakeholders –vs- UsersStakeholders –vs- Users
• StakeholdersStakeholders– Payers, administration, developers, Payers, administration, developers,
endusersendusers
• UsersUsers– Users of the computer systemUsers of the computer system
UIDE Chapter 1UIDE Chapter 1
Star Life CycleStar Life Cycle
• Evaluation-centeredEvaluation-centered
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• The Two Types of Knowledge The Two Types of Knowledge Needed for UI DesignNeeded for UI Design
1.1.Information-gathering and Information-gathering and analyses that form part of the user analyses that form part of the user interface design and development interface design and development processprocess
2.2.User interface design knowledge User interface design knowledge (i.e. design principles, design (i.e. design principles, design rules)rules)
UIDE Chapter 1UIDE Chapter 1
EvaluationEvaluation
– When and How Do You Evaluate?When and How Do You Evaluate?
•Evaluation Early in the Life CycleEvaluation Early in the Life Cycle
•Evaluation Later in the Life CycleEvaluation Later in the Life Cycle
•How Do You Evaluate?How Do You Evaluate?
– Observing the organization and how people Observing the organization and how people workwork
– Interviewing, talking, and asking questionsInterviewing, talking, and asking questions
– Making predictionsMaking predictions
