ABSTRACT
As mentioned in chapter 1, one of the purposes for conducting job analysis and then developing predictor instruments and measures of job performance is to validate selection measures. In this chapter, we describe validation designs, and discuss issues related to collecting and analyzing validity data. For purposes of test refinement, we discuss issues related to item analysis. Item analysis is described both in terms of classical test theory and item response theory (IRT). Because of the complexity of IRT, we only provide an introduction to this topic, assisting the reader in understanding some of the issues related to item analysis when using this theory.
