The basic formula used by the Chapter 1 Migrant Education Program to allocate funds to state agencies includes an adjustment to help defray the cost of summer services for migrant children, which can be particularly expensive. In recent years, policymakers have questioned whether the current funding formula unfairly rewards states with modest programs for large numbers of students, at the expense of states with intensive programs for fewer students. To address such concerns, program and expenditure information related to summer services was collected from 16 local sites in 6 states that have 73 percent of total migrant summer enrollments. This paper: (1) characterizes the needs of migrant children for summer services, compares the needs of migrant and nonmigrant children, compares needs of currently migrant and formerly migrant children, and examines support service needs and unmet needs; (2) describes the summer services provided, including program characteristics, delivery systems, and coordination with regular-term programs and other service providers; and (3) examines expenditures in major cost categories and variations by service delivery model and state. A central finding concerns the much lower costs of home-based services and their use to subsidize more costly campus-based instruction. Recommendations aim to encourage greater service provision to currently migrant children and to discourage the predominant use of home-based services. Appendices cover research questions, selection of local study sites and site descriptions, migrant education program funding history, amount and percent of total expenditures by cost area and site and by funding source and site, and sample per-pupil cost profile. Contains 39 references. (SV)