This training module on basic malaria microscopy is in two parts. Part I, the Learner's Guide, contains all the technical information that will be needed by trainees in this field. Part II is the Tutor's Guide, which gives extensive advice for those responsible for organizing, running and evaluating training programmes. The module is one of two published by the WHO concerned with different aspects of the control of malaria. It can stand alone as a medium for teaching malaria microscopy to public health and laboratory personnel, or can be used as an integral part of a longer and more comprehensive programme of training in malaria.