These systems are considered to be some of the most difficult to model accurately.

Closed systems, on the other hand, are considered to be isolated from their environment.

The system of tax welfare is considered in chapter 10.

As of April 2012, the system has not been considered by anyone.

The system is considered a major reason for Germany's long economic boom.

By Federal standards, a system with 500 or more customers is considered large.

The system might have been considered more risky than those in the other two proposals, he said.

Then other systems should be considered for the particular application.

A system is considered robust if it runs well in any market conditions.

By 1976 this system was still considered useful in any conflict short of nuclear war.