Like many who submit manuscripts to the CHI conference each year, I look forward to reading the reviewers’ reflections on my submissions. This year my coauthors and I were asked to justify the validity of our highly controlled research; similar requests have been made of our recent submissions to journals. In these experiments, we went to great lengths to ensure a high degree of internal validity. Our research goal was to establish a cause-and-effect relationship between what we were manipulating and what we were measuring. The only way to establish cause-and-effect relationships is by using designs with high internal validity.…
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