A random sample of 16 coordinators responsible for implementation of Part H of the Individuals with Disabilities Education Act were interviewed to determine if state data systems will be in a position to assist in monitoring service goals and in reaching populations typically underserved. The interviews assessed the availability of sociodemographic variables in states' Part H data systems and documented coordinators' perceptions of which population was most underserved in their state. It was found that: (1) accurate count of children served may still not be possible for 6 of 16 states; (2) 10 of the 16 states collect information on ethnicity of race; (3) data on family income were collected in 2 states; (4) none of the coordinators identified African Americans as underserved; (5) availability was a key barrier to rural populations, and both availability and accessibility were important barriers to ethnic minorities; and (6) in many cases, data were not collected for groups identified as most underserved. The study concludes that data systems should include the following sociodemographic information on their client population: county of residence, urban/rural/inner city residence, race/ethnicity, income, insurance coverage, and parental employment status. (JDD)