Epidemiology has taken an important part of research on occupational risk. The occupational health physician does not have all clues to understand, participate and organize epidemiologic studies on the workplace. The purpose of this work is to remind and clarify major steps of an epidemiologic survey on the workplace, especially with collaborative work occupational epidemiological unit. Study protocol, which included all major steps of a survey, was detailed. After complete literature review, the protocol of the study must include background, purpose of the study, and the methods to achieve it. The protocol also approached the data collection and other material questions. Results analysis and interpretation were mentioned. One example was also given.