What is Human-Computer Interaction?
Lecture 3
Goals & Evolution of HumanComputer Interaction
In the Last Lecture
• Effect of Bad Tools
• IFE
• Bad-day Clip
• Effect of today’s computers
• human productivity
• employee loyalty
• customer loyalty
• revenue
• Success Criteria in New Economy
In the Last Lecture
Products with a bad user
experience deserve to
DIE !
Engineers Belief
Engineers believe that since they made it, can use it,
everyone can use it
“If WE can use it, YOU can use it. If you can’t, YOU must
be STUPID”
“Users are stupid” – anonymous
“Users are dummies” – anonymous
In Today’s Lecture
• Goals of HCI
• Usability
• User Experience
HCI – A Definition
“Human-Computer Interaction is a
discipline concerned with the design,
evaluation and implementation of
interactive computing systems for
human use and with the study of
major phenomena surrounding them”
The Shopping Analogy
• Types of experiences
• Good or Bad
• Every user is unique
• Experiences are unique
User Experience – A Definition
• The user experience is the holistic combination of
everything that the user
• Sees
• Touches
• Feels
• Interacts with
Usability
• Ensuring that interactive products are easy to
learn, effective to user and enjoyable from the
user’s perspective
Usability Goals
•Effectiveness
•Efficiency
•Safety
•Utility
•Learnability
•Memorablity
Effectiveness
•How good the system is at doing what it is supposed to do
• iDrive system being effective since it would perform all the tasks
• Porsche example the system was effective enough to detect the high intake of Air in
Fuel system
• The Alarm clock is effective in the way that it would play music in exactly the same
way it is supposed to
•Are these systems really effective ? Think again !!
• Main goal of HCI is to evaluate things from the User’s perspective
Efficient
• The way system supports its users in carrying out
their tasks
• Talk about the three systems
• 5 steps I drive
• Does the product help users sustain a high level of
productivity?
Safety
• Protecting the user from dangerous conditions and
undesirable situation
• Which of the Cases we discussed earlier you think was
the most unsafe ?
• Plane
Utility
• System providing the right kind of functionality so
that the user can do what they want
• How useful are computer base devices
• Information on Website has increased ur
knowledge?
Learnability
• How easy a system is to learn to user
• Ten Minute Rule (Jacob Neilson)
• Was iDrive easy to Learn
• Simple Device VCR
• Task 1: Learning to Play
• Task 2: Pre-Record Two Programs
Memorability
• How easy the system is to remember once learnt
• Riding a bicycle
User Experience Goals
•Satisfying
•Enjoyable
•Fun
•Entertaining
•Helpful
•Motivating
• Aesthetically Pleasing
• Supportive to Creativity
• Rewarding
• Emotionally Fullfilling
Today’s Revelation
“Don’t Make me THINK, is the
key to a usable product”
Usability and Quality
• What is Quality?
• You like a product
• Does not break down
• More about Quality later
Software Quality – A Definition
• The extent to which a software product exhibits
these characteristics
• Functionality
• Reliability
• Usability
• Efficiency
• Maintainability
• Portability
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