He said it was still a valid method of deterring crime.

Such physical exams are no longer considered a valid method of determining ancestry.

As a result, election by secret ballot is now the only valid method of electing a Pope.

Is non-sequitur a valid method of constructing a book?

He added that hunting was not a valid method to obtain accurate scientific data.

There are different valid methods to compare water tariff levels.

Modern instruments are reliable and the process is based on presently valid scientific methods.

They use alternative, but equally valid, methods of thinking to arrive at their answers.

Online customers must have access to the Internet and a valid method of payment in order to complete a transaction.

The importance of a reliable and valid method by which results may be analysed has also become evident.