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Rarely, prior introducing the readership main study designs, textbooks on epidemiological methods are discussing about different features/ characteristics of epidemiological studies. Since one study design has several of them, this could be for the audience sometimes rather confusing. To clarify this aspect of epidemiological studies, we decided to describe these features in more details Teaching methods An introductory lecture gives the students insight in different features of epidemiological studies and distinction between them. After introductory lectures students discuss in small groups these features and confront them. Specific recommendations for teachers work under teacher supervision/individual students' work proportion: 30%/70%; facilities: a lecture room, a computer room; equipment: computers (1 computer on 2-3 students), LCD projection, access to the Internet and bibliographic data-bases; training materials: recommended readings or other related readings; t...