This module introduces students to the main concepts involved in epidemiological analyses. The main epidemiological study designs are introduced and two lectures focus on methods used to analyse case-control studies whilst another two focus on cohort studies; a further lecture explores the issues around ecological studies and meta-analysis. Throughout the course students are encouraged to think about the important issues of bias and confounding and how they might influence the results of epidemiological analyses. The issue of causality is also emphasised and students are taught about causal thinking and using Directed Acyclic Graphs. More interactive lectures help students to consider how they would design an epidemiological study and how to weigh the evidence from the results of an analysis.