Many public libraries in the United States have undertaken the planning process suggested by the Public Library Association. They have incorporated into their mission statements some of the Association's eight basic library service roles as local priorities. This study explored the relationship between the chosen service role of 12 public library facilities in Lorain County (Ohio) and the quality of the informational graphics used by the libraries. Criteria for assessment were established, based on published standards for informational graphics in public buildings. A checklist developed from these criteria was used to measure the quality of signs and displays in each library, noting the quality of particular types of graphics and the quality of graphics in six service areas at each site. Types of graphics studied were those used for orientation, direction, identification, and instruction in a public library setting. Design elements observed include legibility, visibility, readability, consistency, and aesthetics. Observational data were then compared with the mission statements of these libraries to determine if any relationship existed between graphics quality and the stated priorities for service. Results indicate that for these libraries, choices of particular service roles have no discernible effect on the quality of the information graphics. Three tables present study findings; and four appendixes contain additional information about service roles, criteria, and the checklist. (Contains 28 references.) (SLD)