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ITM 734 Introduction to Human Factors in Information Systems. Preece Ch 1 and 9.4. Cindy Corritore cindycc@gmail.com. This material has been developed by Georgia Tech HCI faculty, and continues to evolve. And we’re off!. What is Human Computer Interaction Can you define / describe it?. HCI.

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itm 734 introduction to human factors in information systems

ITM 734Introduction to Human Factors in Information Systems

Preece Ch 1 and 9.4

Cindy Corritore

cindycc@gmail.com

This material has been developed by Georgia Tech HCI faculty, and continues to evolve.

and we re off
And we’re off!
  • What is Human Computer Interaction
    • Can you define / describe it?

ITM 734 (Corritore)

slide3
HCI
  • HCI is at the interface between a human and a computer performing a task
    • Task - write document, calculate budget, solve equation, learn about Bosnia, drive home, ...
    • Task might be work, play, learning, communicating, etc etc
  • Essential user activities:
    • Express task (execution)
    • Interpret results (evaluation)
  • Not just on the desktop!
  • How many computers in your family home?

ITM 734 (Corritore)

why should we care
Why should we care?
  • Computers (in one way or another) now affect every person in our society
    • Increasing % utilize computers at work and home
      • Tonight - count how many in your home/apt/room
  • Goal – increase satisfaction, utility, efficiency, and safety
  • Product success may depend on ease of use, not necessarily power
    • But not always – Macintosh OS vs. Microsoft Windows

ITM 734 (Corritore)

goals of hci
Goals of HCI
  • Allow users to carry out tasks
    • Safely (Three-mile Island, ATC)
    • Effectively
    • Efficiently
    • Enjoyably
    • With good utility
    • Ease of learning how to use
    • Rememberablitly (that is, easy to remember)
  • Bottom line
    • Be invisible – highest compliment is no notice of the interface and the interaction (so natural)

ITM 734 (Corritore)

what is difference between
What is difference between
  • User-friendly interfaces

and

  • Programmer-friendly interfaces?

ITM 734 (Corritore)

famous quotations
Famous Quotations

“It is easy to make things hard. It is hard to make things easy.” (Al Chapanis, 1982)

“Learning to use a computer system is like learning to use a parachute – if a person fails on the first try, odds are he won’t try again.” (anonymous)

ITM 734 (Corritore)

key historical events
Key Historical Events
  • Design of the first Mac 1983-1984

“The computer for the rest of us”

  • Introduction of the web

… just leave and go somewhere else

ITM 734 (Corritore)

how improve user interfaces
How Improve User Interfaces?
  • Educate software professionals
    • Do NOT wait ‘til the end
    • Good UI can not be pasted on top of poorly-designed functionality
  • Integrate UI design methods, techniques and knowledge into standard software development methodologies

ITM 734 (Corritore)

ui design develop process
UI Design / Develop Process
  • NOT waterfall development (no iteration)
  • NOT RAD (more limited user involvement)
  • eXtreme Programming (iterative with users in strict timeframe)

ITM 734 (Corritore)

ui design develop process1
UI Design / Develop Process
  • User-Centered Design
    • Analyze user’s goals & tasks
    • Create design alternatives
    • Evaluate options
    • Implement prototype
    • Test - Evaluate
    • Refine
    • IMPLEMENT THE REAL SYSTEM
    • Be prepared for further iterative refinement

ITM 734 (Corritore)

preece process of id
Preece process of ID
  • Distills into four activities
    • Identifying needs and establishing requirements for the user experience
    • Developing alternative designs that meet those requirements
    • Building interactive versions of the designs so that they can be communicated and assessed
    • Evaluating what is being built throughout the process and the user experience that it offers

ITM 734 (Corritore)

keep in mind
Keep in mind…
  • 3 principles of user-centric design
    • Early focus on users and tasks
    • Empirical measurement
    • Iterative design

ITM 734 (Corritore)

know thy users
Know Thy Users!
  • Physical & cognitive abilities & special needs
  • Personality & culture
  • Knowledge & skills
  • Motivation
  • Two Fatal Mistakes:
    • Assume all users are alike
    • Assume all users are like you
      • Please leave your ego at the door

You Are Here

ITM 734 (Corritore)

user expectations 1
User Expectations (1)

Some users expect the computer-based system to be just like the old system….

ITM 734 (Corritore)

user expectations 2
User Expectations (2)

Other users expect the system to work magic…..

ITM 734 (Corritore)

design evaluation
Design Evaluation
  • Both subjective and objective metrics
  • Some things we can measure
    • Time to learn
    • Speed of performance
    • Rate of errors by user
    • Retention over time
    • Subjective satisfaction

ITM 734 (Corritore)