Cooperation between schools and public libraries is an important element of library service to children and young adults. A questionnaire was mailed to a random sample of 88 public libraries in Ohio in order to identify the types of cooperative efforts currently taking place. The survey achieved a return rate of 67% (n=59). A model was created to classify the types of cooperation according to the characteristics of the activities in which the respondents were engaged. Five levels of cooperation were included in the model: no cooperation, informal communication, informal cooperation, formal cooperation, and formal coordination. The majority of activities mentioned by respondents fell within the category of informal cooperation, at which activities often focus on a specific event or issue, such as a book-talk or class visit. All of the libraries surveyed engaged in some form of cooperative activity with public schools, with the most common activities including: class visits to the public library; written/oral communication to school personnel promoting library services; planning and promotion of summer reading programs; assignment alerts; and resource sharing. Reasons why there appears to be no movement to higher levels of cooperation and suggestions for future studies are discussed. Appendices include the survey and cover letter. (Contains 20 references.) (Author/SWC)