 Impairment is critical on this analysis. Disability is distinct from other bodily-based social categories on this definition precisely because it is a response, of a certain distinctive sort, to social perception about bodily properties, namely impairment. Race, gender, and orientation identity would be different (thought possibly overlapping) responses to different (again, possibly overlapping) bodily properties. Howard and Aas do not, however, defend the biological reality of impairment; it suffices for their account that society itself employs some notion of biological abnormality or insufficiency, saying with the classic social model that disability is a matter of being classified as impaired, and excluded on that basis.