This case study is based on a research project the first author conducted for his master's thesis under the guidance and supervision of the second author, his academic adviser. In this case study, we highlight some of the most important aspects of the project. Specifically, we explain how our research was prompted by the lack of empirical testing…

Presented at the Annual National Council on Measurement in Education (NCME) in New York in March 2008. This presentation explores how different item weighting can affect the effective weights, validity coefficents and test reliability of composite scores among test takers.