A key problem in working conditions is the high work load.

A key problem was a new computer system for financial records.

The key problem is not one of technology; in fact it's physics.

But lack of productivity growth is not the key problem.

A key problem, he said, is poor enforcement of the press law.

The key problem with almost all political consultants is that they don't know anything about issues.

"The key problem seems to be older women voters," she said.

We also need to address some of the key problems affecting the industry.

Like it or not, immigration is the key problem of the new century.

One of the key problems was education for the children.