This special issue contains essays regarding the CHI '95
conference, which featured a panel titled, Discount or Disservice?
Discount Usability Analysis: Evaluation at a Bargain Price or
Simply Damaged Merchandise? Wayne Gray, who organized the panel,
presented a controversial critique of studies that had evaluated
various usability evaluation methods (UEMs). The level of interest
in this discussion led Gray to propose a review article that dealt
with the issues in a more systematic fashion. The resulting essay,
written by Gray and his collaborator Marilyn Salzman, conducted an
in-depth review of a series of influential studies that used
experimental methods to compare a variety of UEMs. Gray and
Salzman's analysis was framed using Cook and Campbell's (1979)
well-known discussion of various forms of validity. They used this
to evaluate numerous details of these comparative studies, and they
concluded that the studies fell short on the criteria by which good
experimental studies are designed and interpreted.
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