Surveys of managers ( 1973) and of a sample of producers ( 1976 ) provided information about and evaluations of services performed by 40 fluid-milk marketing cooperatives wit h headquarters in the north central region. Analysis was by both type and size of cooperative. Information obtained included identification of services provided at both farm and market levels, their estimated costs, managerial and member evaluations of their importance, extent of producer knowledge about them, management and member reactions to services-related statements and issues, and relations to membership problems.