For many systems arising in physics, this is indeed a useful approach.

Many say that a more useful approach to standards is to specify what money, technology or other materials should be available to all schools.

Smart Money takes a different, and perhaps more useful, approach.

Working in groups or utilising classroom discussion could be a useful approach.

A more useful approach may be to identify uses of electronic publishing systems and to examine these.

This is a useful approach, which Congress might consider for its own purposes.

It is a particularly useful approach when comparing otherwise similar sites.

A more useful approach is to analyze a failure in terms of problems with strategy.

"It would be a useful approach if we could find a way to do that," she said.

For the most part, I was able to incorporate these into my report, because they embodied useful approaches.