By coupling the ODE solver with other numerical operators and methods a continuous simulator can be used to model many different physical phenomena such as There is virtually no limit to the kinds of physical phenomena that can be modeled by a system of ODE's.
Some systems though can not have all derivative terms specified explicitly from known inputs and other ODE outputs.
Using a discrete event simulation makes it necessary to have an occurring event to change the number of sales.
In contrast to this the continuous simulation has a smooth and steady development in its number of sales.
Since that time continuous simulation has been proven invaluable in military and private endeavors with complex systems.