The Wisconsin Department of Public Instruction's Division for Libraries and Community Learning frequently receives requests for information on the legality and desirability of combining school and public libraries. The purpose of this publication is to help communities and school districts determine whether a combined school and public library will be the best way to provide the most efficient library service for all community residents. A combined school and public library is one that is located in a single facility and operates cooperatively to perform the curriculum support functions associated with a school library, as well as to provide the broader library service needs of children, young adults, and adults that are commonly the focus of the public library. Topics covered are: planning issues; mission statements; the legal framework for combined school-public libraries in the state of Wisconsin; and a list of key issues to be considered when examining the feasibility of establishing such a library. A feasibility checklist developed to help make a decision concerning library service is also included and covers planning, governance, administration and funding, access to information and materials, the physical facility, technology, and attitudinal factors. Included in the appendices are: descriptions of existing combined school and public libraries in Wisconsin; examples of alternative methods for improving library services; a selected bibliography; statutory references; and sample master agreement. (AEF)