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Evaluating Interactive Systems (Expert evaluations (Expert reviews (What…
Evaluating Interactive Systems
Expert evaluations
Expert reviews
What is it?
identification of usability problems
predicting problems they think will be experienced by users
sometimes report quantitative assessments
rely on expert judgment
primarily formative
evals done without users
Why?
resources
impossible/undesirable to use users (confidentiality, practicality)
Who is an "expert"?
HCI professional
domain experts
3-5 recommended
Pros
easy, fast, cheap
tend to get the big usability issues
Cons
difficult to eval from perspective of real users
depends on experts' knowledge
often yield lots of minor problems
TYPES
Summative
benchmark reviews
quantifying the UX
Purdue Usability Testing Q
Formative
informal review
guideline rview
formal inspection
heuristic eval
cognitive walkthrough
no longer widely used
exploratory browsing
experts walk through a task with the design
at each action, the expert answers 4 Qs
does the user have the right conceptual model?
is the action visible?
is the labeling signifying?
will the user get good feedback?
good for testing learnability (atm)
systems you should be able to learn by exploratory browsing
Data analysis
group problems across evaluators
categorize problems
assess severity
suggest fixes
see examples online
Madame Tussauds example
pluralistic walkthrough
What to prepare
system
experts
heuristics
How to do it
2 passes
first find issues
then rate the severity and combine answers with other experts