Dynamic models of many processes in pharmacokinetics, metabolism, epidemiology, ecology and other areas are derived from mass balance considerations. These models lead to particular systems of ordinary differential equations, that are called compartmental systems.
The authors review the qualitative results on nonlinear compartmental systems and present a unified and simplified theory for such systems. They also present an overview on the theory of linear compartmental systems. Finally, they show how to partition compartmental systems of arbitrary connectivities into four basic types and give a qualitative analysis for autonomous nonlinear compartmental systems of the four basic types.