Table Of Contents: *Introduction to Epidemiological Research *Principles of Scientific Research: Deductive Methods and Process of Conjecture and Refutation *Scientific Hypothesis and Degree of Corroboration *Causal Inference and Decision *Basic Principles of Measurement *Basic Measurements in Epidemiological Research *Study Design *Adjustment and Standardization of Rates *Introduction to Sampling Method and Practical Applications *Follow-up Study *Case-control Study *How to Critically Review an Empirical Study *Application of Epidemiological Methods in Health Service Research and Policy