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Knowing What Students Know: The Science and Design of Eduacational Assessment
show what a student actually can or cannot do. A score indicating that a student is in the 40th percentile in mathematics does not reveal what mathematics knowledge the student does or does not have. The student may have answered most items correctly if the norm group was high-performing, or may have answered many questions incorrectly if the norm group performed less well. Nor does the norm-referenced score indicate what a student needs to do to improve. In the 1960s, Glaser (1963) drew attention to the desirability of shifting to criterion-referenced testing so that a student’s performance would be reported in absolute terms, that is, in terms of what the student can or cannot do.
…the specific behaviors implied at each level of proficiency can be identified and used to describe the specific tasks a student must be capable of performing before he achieves one of these knowledge levels…. Measures which assess student achievement in terms of a criterion standard thus provide information as to the degree of competence attained by a particular student which is independent of reference to the performance of others, (pp. 519–520)
The notion of criterion-referenced testing has gained popularity in the last few decades, particularly with the advent of standards-based reforms in the 1990s. As a result of these reforms, many states are implementing tests designed to measure student performance against standards in core content areas. A number of states are combining these measures with more traditional norm-referenced reports to show how students’ performance compares with that of students from other states as well (Council of Chief State School Officers, 2000).
Because criterion-referenced interpretations depend so directly on a clear explication of what students can or cannot do, well-delineated descriptions of learning in the domain are key to their effectiveness in communicating about student performance. Test results should be reported in relation to a model of learning. The ways people learn the subject matter and different states of competence should be displayed and made as recognizable as possible to educators, students, and the public to foster discussion and shared understanding of what constitutes academic achievement. Some examples of enhanced reporting afforded by models of learning (e.g., progress maps) are presented in Chapter 4.
Fairness in testing is defined in many ways (see AERA et al., 1999; NRC, 1999b), but at its core is the idea of comparable validity: a fair test is one that yields comparably valid inferences from person to person and group to group. An assessment task is considered biased if construct-irrelevant characteristics of the task result in different meanings for different subgroups.