There is a distinction that one learns about on the first day of a course in psychological research methods. It is the difference between internal and external validity. Internal validity is ...

Improving the validity of your market research can increase the effectiveness of your marketing strategies. When you know what members of your target market are doing and what they want, you can ...

Correspondence to Johann Windt, Department of Experimental Medicine, University of British Columbia, Vancouver, V5Z 1M9, Canada; johann.windt{at}usoc.org Athlete self-report measures (ASRMs) are an ...

From the perspective of score interpretation, the purpose of testing accommodations is to reduce the dependence of test scores on factors that are irrelevant to the construct that is being assessed.