High Quality Content by WIKIPEDIA articles! A multi-compartment model is a type of mathematical model used to describe the way materials or energies are transmitted among the compartments of a system. Each compartment is assumed to be a homogenous entity within which the entities being modelled are equivalent. For instance, in a pharmacokinetic model, the compartments may represent different sections of a body within which the concentration of a drug is assumed to be uniformly equal. Hence a multi-compartment model is a lumped parameters model. Multi-compartment models are used in many fields including pharmacokinetics, epidemiology, biomedicine, systems theory, complexity theory, engineering, physics, information science and social science. The circuits systems can be viewed as a multi-compartment model as well. In systems theory, it involves the description of a network whose components are compartments that represent a population of elements that are equivalent with respect tothe manner in which they process input signals to the compartment. It was introduced in the field of Operations research by Jay Forrester as a methodology that became known as System Dynamics.