A rationale is presented for the use of many cases in policy analysis. Case study families were selected from nomination by early intervention professionals in three states with differing early intervention policies and procedures. Using rating scales, demographic data, and interview transcripts with 72 families of children receiving services, 7 sets of results were found: (1) families reacted positively to services; (2) families had problems with service transitions; (3) numerous service settings were used; (4) the focus of service was primarily on children's needs; (5) control over services varied by demographic variables; (6) psychological well-being was affected by income and race; and (7) perceptions of support differed by demographic variables. The benefits to answering research questions through the use of large-sample case studies and the challenges to implementation are discussed. The combination of quantitative and qualitative methods and data revealed the complexity of interactions among children, parents, professionals, and community systems. Conclusions note implications for policy and practice. (Contains 1 figure and 19 references.) (SLD)