The Meningitis Hypertext Case Study is a computer-assisted learning module developed by the Liverpool Epidemiology Programme as part of a comprehensive set of modules and case studies to assist health workers to learn epidemiology. The objectives of the case study are to highlight important concepts in diagnosing an epidemic of meningitis. It has been developed using hypertext software (LINKWAY) which allows interactions with other epidemiological software (EPI INFO) for the analysis of the data. The case study makes extended use of graphical displays, has a 'user-friendly' presentation and can be used by individuals and groups. Our initial experience indicates that this form of computer-assisted learning has considerable potential by providing users with an organized path through a series of problems set in a realistic environment. This could prove to be potentially useful in developing countries where up-to-date learning materials are often unavailable.