Consider test data, a specified set of dichotomous skills measured by the test, and an IRT cognitive diagnosis model (ICDM). Statistical estimation of the data set using the ICDM can provide examinee estimates of mastery for these skills, referred to generally as attributes. With such detailed information about each examinee, future instruction…

A variety of practical applications of item characteristic curve test theory are discussed. Among these applications are tailored testing, two stage testing, determining whether two tests measure the same latent trait, and measuring item bias towards minority or other groups. (Author/JKS)

Multiple-choice reading comprehension items from a conventional, norm-referenced reading comprehension test were successfully analyzed using a simple latent class model. Results support the use of latent class, state mastery models with more heterogenous item pools than has been previously advocated. (Author/PN)