Human-Computer Interaction Overview - PowerPoint PPT Presentation

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Human-Computer Interaction Overview

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Human-Computer Interaction Overview Benefits of more usable Websites History of HCI Goals of HCI User-Centered Methodology – PowerPoint PPT presentation

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Title: Human-Computer Interaction Overview


1
Human-Computer InteractionOverview
  • Benefits of more usable Websites
  • History of HCI
  • Goals of HCI
  • User-Centered Methodology

2
Have you ever
  • been unable to find something in a website that
    you know is there?
  • recevied a useless or misleading error message?
  • wondered why a website needs to know your e-mail
    address?
  • left a site for fear information you provided
    might be misused?

3
It should not be that way
  • Websites can be designed to be
  • Pleasant convenient for users.
  • where users can acomplish their goals.
  • The Key is to think about users
  • Learn about them
  • Observe them
  • Interview them

4
Benefits of usable Websites
  • Gaining a competitive edge
  • Reducing development/maintenance costs
  • Improving user productivity
  • Lowering support costs

5
Gaining a competitive edge
  • Number of hits to a site vs conversion rate
  • Number of hits only counts visitos not sales
  • Conversion rate is the percentage of visitors who
    take an action you want them to take
  • Higher conversion rates leads to lower sales cost
  • Most significant factor in higher conversion rate
    is the ease of use
  • Average conversion rates were 3.2 in 2003

6
Reducing development/maintenance costs
  • Learn about users first to avoid
  • Implementing features that users do not want.
  • Features that are annoying or inefficient.
  • Making changes late in the development cycle
    (high cost).
  • Lower life-cycle maintenance cost.
  • Most maintenance costs come from unmet or
    unforeseen user needs

7
Improving User Productivity
  • e-commerce users find what they wantand succeed
    in buying it
  • company intranet employees become more efficient

8
Lowering support costs
  • Calls to costumer support are very expensive
  • Average service call is 12 to 250
  • Wall-Mart shut down shopping site for three weeks
    (1999)
  • Customer confusion affecting support systems
  • A Website that reduces support calls can result
    in tremendous savings

9
What is HCI?
  • 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 the major
    phenomena surrounding them.
  • Special Interest Group on Human-Computer
    Interaction (SIGCHI) of the Association for
    Computing Machinery (ACM)

10
Interactive Computing Systems
  • Examples
  • A PC used for Web browsing e-commerce, database
  • Embedded devices automobiles, planes
  • Handheld devices cells phones, GPS, Palm pilots,
    etc.
  • Software for multi-user collaboration

11
Computing Cost Shift
  • 40 year ago
  • cost of one computer salary of 200 programmers
  • today
  • salary of one programmer cost of 200 computers
  • Now
  • goal is to make computers easy to use, to save
    user time

12
How to make computers easy to use?
  • Applying principles of Human-Computer Interaction
  • Consider physical limitations
  • Consider the environment where it is located
  • By being and advocate of the user
  • an HCI practitioner listens to the users and
    communicates with the development team

13
Goals of HCI
  • Develop or improve
  • Safety
  • Utility
  • Effectiveness
  • Efficiency
  • Usability
  • Appeal
  • . . . of interactive systems that involve
    computers

14
Safety
  • Safety of Users
  • Air traffic control
  • Hospital intensive care
  • Hospital radiation unit
  • Safety of Data
  • Protection of files from tampering
  • Privacy and security

15
Utility
  • what services a system provides
  • Information
  • Instruction
  • Purchases
  • Banking transactions
  • Investing
  • Etc.

16
Effectiveness
  • Users ability to achieve goals
  • Find desired information
  • Enter credit card data
  • Arange a payment
  • Able to upload a class assignment
  • A web site might provide all necessary services,
    but if users cant find the items they want to
    buy, the site lacks effectiveness

17
Efficiency
  • Measures how quickly users can accomplish their
    goals using the system

18
Usability
  • Ease of learning
  • Ease of use

19
Appeal
  • How well users like the system
  • First impressions
  • Long-term satisfaction
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