This instructional module discusses the one-, two-, and three-parameter logistic item response theory (IRT) models. Mathematical formulas are given for each model and they are compared, with figures illustrating the effects of changing parameters. A single data set is used to demonstrate the effects of changing parameter values. (SLD)

This module is one of a series of learning modules designed to help vocational education administrators to improve their skills. The module addresses two types of information-gathering or inquiry skills that will help an administrator collect information for decision making: (1) developing and using questionnaires and structured interview…

This document is intended to help practitioners and researchers in the United Kingdom find and use Internet-based research resources dealing with raising achievement. The introduction discusses the state of research into school effectiveness in the United Kingdom and elsewhere. Part A, which reviews available World Wide Web sites devoted to…