Marker Variables: A Search for Comparability and Generalizability in the Field of Learning Disabilities 1

The learning disability field has been plagued by unclear definitional criteria resulting in inconsistencies and confusion regarding research findings and program effects. The concept of marker variables as presented by Keogh et al. may be a means of guiding research and comparing research results. Marker variables may be thought of as a set of core variables which are collected in common by those conducting research within a given field. The identification and adoption of a systematic, cooperative approach to the documentation of research and intervention with learning disabled students would aid in the comparability and generalizability of the findings. This article discusses the concept of marker variables as they are being applied to the learning disability field in the UCLA Marker Variable Project.