A computer assisted book on medical helminthology has been prepared using ZOOM, a teaching computer program, which uses hypermedia technology to link pictures and text. Information on various helminths, including their morphology, life cycle, clinical manifestations, diagnosis, treatment and epidemiology can be easily accessed using three types of link in a non-linear approach. The book consists of five chapters, each contains the latest information on various aspects of helminth parasites. New information can easily be added to each chapter by the user. References can be assessed and updated for each parasite. The book is designed for students of medical schools, health administrators and physicians in developing countries.