An item discriminability study of the Iowa Tests of Basic Skills Language Skills tests identified test items that are robust discriminators, psychometrically capable of separating low scorers from higher scorers in the language tests battery. The analysis was conducted by calculating a point-biserial correlation for each item on the four language…

Item responses from a standardized language arts usage and expression test were submitted to an ordering-theoretic data analysis procedure to identify the significant prerequisite relationships that underlay the data set. Responses were elicited from a sample of 81 sixth graders who took the Iowa Tests of Basic Skills, Form G, Level 12 usage and…