This manual is designed to be used by the trainee at Special Program for Research and Training in Tropical Diseases and Good Laboratory Practice training workshops. It contains an introduction which highlights the history of the OECD principles of GLP, and the fundamental points. Included is training on the resources required (personnel and facilities); preparation of the protocol and standard operating procedures (SOPs); characterization of the test item (its storage, use, quality control, test system); documentation (reporting, deviations from the protocol, indexing, archiving, retrieval); a