Background: Professional standards for validity of achievement tests have long reflected a consensus that validity is the degree to which evidence and theory support interpretations of test scores entailed by the intended uses of tests. Yet there are convincing lines of evidence that the standards are not adequately followed in practice, that…

Several common sources of error in assessment that depends on the use of judges are identified, and ways to reduce the impact of rating errors are examined. Numerous threats to the validity of scores based on ratings exist. These threats include: (1) the halo effect; (2) stereotyping; (3) perception differences; (4) leniency/stringency error; and…

In September 1991, the National Assessment Governing Board (NAGB) announced standards for basic, proficient, and advanced achievement in mathematics and reported that few American students had reached these standards. Expert reviewers noted technical problems with the NAGB approach and questioned its results. In this report, the NAGB…