Human Computer Interaction CM50110

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Human Computer Interaction CM50110
Evaluation
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Human Computer Interaction

• A discipline concerned with the

of interactive computing systems for human use
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Consumer Products

• Youre watching a film at home
• The phone rings
• You want to pause the film
• Compare the remote controls

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Consumer Products
A
B
What do you think?
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Consumer Products
Perhaps its my fault I should memorise the
instructions
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So what does this teach us?

• Lesson 1
• many failures in HCI result from designs that
  dont recognize peoples capabilities and
  fallibilities
• this leads to apparent machine misuse and human
  error
• Lesson 2
• good design always accounts for human
  capabilities.
• How you can train yourself
• look for examples of human error
• critique them for possible design error
• propose designs that limit / remove these errors

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Human Computer Interaction

• A discipline concerned with the

of interactive computing systems for human use
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Why should we care?

• Consequences of bad design now large
• costly errors in serious systems (e.g., financial
  institutes)
• widespread effects (e.g., incorrect billing,
  failures)
• life-critical systems (medical, air traffic
  control)
• safety (in-car navigation systems)
• Professionalism
• software engineers are designers
• we are ultimately responsible for the products we
  build

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Usability Evaluation

• Several techniques
• Involving users
• User test think-aloud
• Cooperative Evaluation
• Not involving users
• Heuristic evaluation
• Cognitive walkthrough

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Method 1Cooperative evaluation

• A user, an evaluator, and an interviewer.
• User runs through a task.
• Interviewer guides user, asks questions.
• Evaluator observes users actions.

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Usability Evaluation

• Example of cooperative evaluation
• Task Correct your computer's date and time

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Method 2 Heuristics

• Find a set of heuristics (rules) which apply to a
  certain type of system.
• Run through the heuristics, analysing each point.
• Example http//www.bath.ac.uk/comp-sci/units/pg/c
  m50110/HeurEvalChklst.pdf LINK
• What are the disadvantages of this method?

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Exercise Cooperative Evaluation

• In pairs
• Find the cheapest 1Gb
  from
• www.amazon.co.uk
• www.ebuyer.co.uk
• www.misco.co.uk
• Can you recommend improvements?

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Exercise Heuristics

• Using the heuristics found on the following web
  page (or any other appropriate heuristics you can
  find)
• http//user-experience.org/uefiles/writings/
• heuristics.html
• Analyse the following web site http//www.uob.bh/