Use of such authorities requires written justification and approval at specified levels.

Of all human activities, fighting for your country is the one that requires most elaborate justification.

It requires justification: one must have good reasons for believing.

I've done nothing I'm ashamed of, and certainly nothing I feel requires justification to you.

Therefore, the application of the describing function method requires additional justification.

Thus, according to general consensus, these experiments require ethical justification.

But in this time of tight budgets, any new expenditures require strong justification.

She appeared as a justification of her own actions, which somehow seemed to require justification.

I voted against Amendment No 5 today only because, in my opinion, it would have required justification.

That is a very important matter and, in future, we at least will be requiring functional justification before spending is approved.