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...Slide exploratory studies are conducted when little is known about the phenomenon of interest and a flexible rather than structured approach to data collection useful descriptive describe phenomena or relationship between variables they scientifically more rigorous because enough information relationships for hypotheses be tested much epidemiologic research this type explanatory search causal explanations researcher manipulates exercises some control over conditions retrospective examine factors after fact have occurred event illness exposure being studied has already looks into past participant prospective classification whose purpose cause effect change as it unfolds time randomized controlled trials studying new drugs cross sectional take snap shot at one point in census an example study longitudinal designs design that repeatedly observes examines set subjects with respect term confused panel which examples birth cohort great britain these continuing projects every child born engla...