Basic study designs in analytical epidemiology -- Measuring disease occurrence -- Measuring associations between exposures and outcomes -- Understanding lack of validity : bias -- Identifying noncausal associations : confounding -- Defining and assessing heterogeneity of effects : interaction -- Stratification and adjustment : multivariate analysis in epidemiology -- Quality assurance and control -- Communicating results of epidemiologic studies -- Epidemiologic issues in the interface with public health policy.