Often an empathetic, objective third party, perhaps a spouse or trusted colleague, can show us which tensions have no sound basis.

The system could then have been defended on the sound basis that no student would have to pay back more in real terms than he or she received.

A not-for-profit company was formed to administer the publication on a financially sound basis.

This, together with her musical competence, provided a sound basis on which to develop a new type of ballet.

There are other more curious cases on which more detailed research needs to be done to establish a sound basis.