Meyer, R.H. (2000).
Value-added indicators: A powerful tool for evaluating science and
mathematics programs and policies. Issue Brief, 3(3). Madison:
University of Wisconsin, National Institute for Science Education.
manuscript describes the weaknesses of using average and median test scores
and proficiency-level indicators and the advantages of using value-added
indicators in measuring the performance of schools, programs, and policies.
Meyer stresses that average test scores used as a variable to measure
student achievement, is “contaminated” by factors aside from school
performance, including student, family, and community characteristics.
Value-added modes have the option of examining these other factors and
separating them in the statistical model.