Causal pie model
In the field of epidemiology, the causal mechanisms responsible for diseases can be understood using the causal pie model, where each pie in the diagram represent a theoretical causal mechanism for a given disease, which is also called a "sufficient cause". Each pie is made up many component factors, otherwise known as "component causes". In this framework, each component cause represents an event or condition required for a given disease or outcome. A component cause that appears in every pie is called a "necessary cause" as the outcome cannot occur without it. Causal pie model In