This module introduces learners to thinking “epidemiologically” and the principles of epidemiology including applied epidemiology. The module introduces software for questionnaire design and data collection. Basic principles such as rates ratios and proportions are explained. Key study designs used in epidemiology (include cross-sectional, cohort, case-control, ecological, randomised control trials and sub-groups are introduced. This module introduces learners to the development and application of statistical reasoning and methods addressing, analysing, and solving problems in public health-, health care-, and biomedical, clinical-, and population-based research.