What is Human-Computer Interaction?

Lecture  3

Goals & Evolution of Human￾Computer 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 a detailed collection 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 well the system performs its intended functions • The iDrive system's efficiency because it would complete all tasks • In the Porsche case, the system was able to detect the high air intake in System of fuel • The alarm clock works well because it plays music 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

• How the system helps its users carry out their duties • Discuss the three systems. • 5 steps I drive

 • Does the product assist users in maintaining a high level of productivity?

Safety

• Protecting the user from dangerous conditions and 

undesirable situation

• Are you remember the Cases we discussed earlier you think was 

the most unsafe ?

• Plane

Utility

• System always try to  providing the best and 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 simple it is to learn how to use a system

• 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 simple it is to remember the system after learning it

• 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

• How much a software product demonstrates

• Functionality

• Reliability

• Usability

• Efficiency

• Maintainability

• Portability