"A lot of useful ideas are simply beyond a secretary general's reach," he said.

Splitting the group up into small parties, each led by a parent who already has children at the school is a useful idea.

The five of us should be able to come up with a useful idea.

There is a long list of useful ideas in complex analysis, going from the reasonably clear to the those that are more difficult.

They frequently offer useful ideas and strategies, but should usually be considered as examples only.

But it did seem a useful idea to make a serious attempt to wing one of them.

They were happy for even momentary attention but only one had any useful idea.

But today it strikes me as a very useful idea.

If you have any useful ideas at all, I wish you'd share them with me!

Hopefully, at least one or two useful ideas will come out of it.