According to the National Center for Science and Engineering Statistics , National Science Foundation (NSF), the data available on people with disabilities in science and engineering is seriously limited for the following reasons.
- Operational definitions of disability vary, include a wide range of physical and mental conditions, and thus are not totally comparable.
- Data on disabilities is frequently not included in comprehensive institutional records.
- Information about people with disabilities is often obtained from self-reported responses to surveys. The resulting data reflects individual perceptions rather than objective measures.
For these reasons, even when there is considerable information available about the number of individuals with disabilities in the education system and in the science and engineering workforce, it is often impossible to develop accurate comparison figures. For data on people with disabilities and science and engineering consult the Women, Minorities, and Persons with Disabilities in Science and Engineering  publication on the NSF website.
-  National Center for Science and Engineering Statistics
-  Women, Minorities, and Persons with Disabilities in Science and Engineering