It is also a necessary precondition for employment in the civil service.

"This is a necessary precondition for any successful action," Spencer said.

The necessary preconditions are probably the most difficult part.

Ultimately, perhaps, but only after the other necessary preconditions had been met.

Safety is a necessary precondition to successful enforcement of any security policy.

"But the necessary precondition is pluralism of countries," he said.

A political agreement would be "a necessary precondition" for the deployment of an international force, it added.

This, moreover, is a necessary precondition to taking on new members.

Real European economic governance is a necessary precondition for this.

It is of course a necessary precondition, but more is needed.