The aim of this study was to gather information on the tools used by special education teachers for the assessment of severely intellectually disabled students (SID), preparing an individual education plan, and about the methodology used for monitoring their learning progress. The survey included all Finnish special education teachers working with children who were placed in groups for the severely, intellectually and multiply handicapped in Finnish comprehensive schools. According to the survey, the teachers mentioned that they used 22 different methods for assessing SID students. The most widely used tools were those based on developmental psychology, and originally intended for assessing autistic children. (Contains 1 table.)