Book excerpt: The present manual tries to respond to the specific needs of occupa- tional health epidemiology. Rather than a comprehensive review of the subject, the book presents a series of articles. The first four chap- ters deal with general principles and definitions in occupational epi demioligy and describe the work-related hazards and diseases. Chapter 5,6 and 7 deal with information collection and the use of data in the assessment of health risks and in descriptive epidemiology. General methods for epidemiological studies are discussed. The following chap ters address specific aspects such as the study of combined effects, the statistical analysis of epidemiological data, the validity as- pects of epidemiological studies, including consideration on the pro- blems of 'false positive' and 'false negative' results and the basis for causality judgment or the particular interest of experimental epi demiology in occupational health. Chapters cover two special issues of importance to workers' health, namely occupational stress and the epidemiology of accidents.