Finally, the model considers economic indicators by reviewing interest rates and inflation, among other things.

Basic models of population genetics consider only one gene locus at a time.

The Hertzian model of contact does not consider adhesion possible.

This model considers the case of more than one failed machine being repaired by single repairman.

The model considers the event that the amount of money reaches 0, representing bankruptcy.

Such models consider a large number of small interacting individuals who interact with each other.

Prior to 1991, models had generally considered effort on a single task.

The model considers the path loss, S, to be a product of three factors.

The model also considered environmental and animal agents.

These models are open, and consider that it is hard to predict exactly the impact of a policy measure.