Basic study designs in analytical epidemiology -- Measuring disease occurence -- 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