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.