The Bayley-III accommodated for motor and/or visual impairment:“Low motor/vision version”.

Introduction: The aim of the newly developed Low Motor/Vision (LM/LVi) version of the Dutch Bayley-III is to increase the suitability of the instrument for testing children with a motor and/or visual impairment. Method: We tested 64 children with motor and/or visual impairment with the Low Motor/Vision version and the standard Bayley-III, in counterbalanced order. In addition, we tested a control group of 41 children without impairment with both versions of the instrument. Test administrators filled in an evaluation form about the suitability of LM/LVi-version for the specific child tested.Results: The results will be available at the time of the conference. We expect that children with motor and/or visual impairment will obtain higher scores on the Low motor/vision version of the Bayley-III than on the standard version, which would show that the children benefit from the accommodations. The control group is expected to obtain equal scores on both version of the instrument, which would support the idea that the item content and item difficulty have not changed compared to the standard version of the instrument. If not all children with impairment benefit from the accommodations, we will study the characteristics of the group of children that does benefit from the accommodations.Discussion: If the outcomes of the study show that the accommodations increase the validity of the Bayley-III when testing children with motor and/or visual impairment, this will have major implications for practice. Developmental psychologists will then be able to assess the development of children with a motor and/or visual impairment more validly then is currently possible and will consequently be able to provide more adequate support and advice