The importance of student assessment, particularly for summative purposes, has increased greatly over the past thirty years. At the same time, emphasis on including all students in assessment programs has also increased. Assessment programs, whether they are large-scale, district-based, or teacher developed, have traditionally attempted to assess students using a single instrument administered to students under the same conditions. Educators and test developers, however, are increasingly acknowledging that this practice does not result in valid information, inferences, and decisions for all...

The importance of student assessment, particularly for summative purposes, has increased greatly over the past thirty years. At the same time, emphasis on including all students in assessment programs has also increased. Assessment programs, whether they are large-scale, district-based, or teacher developed, have traditionally attempted to assess students using a single instrument administered to students under the same conditions. Educators and test developers, however, are increasingly acknowledging that this practice does not result in valid information, inferences, and decisions for all...