Described are the steps involved in revising the Peabody Mobility Scale (PMS), an instrument for assessing the orientation and mobility skills of multiply handicapped blind children. Among the revision procedures discussed are a redefinition of item content for mobility and prerequisite skills, and alteration of the format to that of an easily administered criterion referenced framework. An example of the revised PMS walking assessment is included, as well as a review of interrater-reliability and predictive validity statistics. (CL)