1. Epidemiological Studies: These include cohort, case-control, and cross-sectional studies that collect data on genetic markers and environmental exposures. 2. Statistical Methods: Techniques such as logistic regression, Cox proportional hazards models, and machine learning are used to analyze data for interactions. 3. Molecular Epidemiology: This field combines molecular biology with epidemiology to study how genetic variations influence the response to environmental exposures at the molecular level.