Particularly in the upper reaches of the secondary school, this could be a useful means to flexibility.

Such questions will often generate discussion among the students generally and thus provide a useful means of stimulating their interest.

It is also a useful means of identifying difficult points without which either party will not complete the transaction.

This is a useful means of gathering evidence for assessment purposes.

To be useful means, I suppose, to help others.

It appeared that they might possibly be a useful means of defense.

Black holes could form a useful means of travel into the future.

It was a useful means, anyway, of catching her eye.

In order to make our territories safer, all useful means must be implemented.

It had been but a useful means to sound me out; was she finally coming to the real reason why she'd asked me here?