The accurate diagnosis of PTSD also requires the use of reliable and valid instruments.

Graves himself, however, never built a test for his theory and doubted that a simple, valid instrument could be constructed to measure levels of psychological development accurately.

Such research would be helped by the development of valid, reliable instruments to measure quality of life in common minor illnesses.

The Commission justified the exclusion based on Goma's implicit and later explicit refusal to recognize the board as a valid instrument.

A written assessment test is a valid and cost-effective instrument to measure communication skills.

Mr President, the unilateral attack by the United States demonstrates once again that the United Nations has not been a valid instrument.

I would personally like to be optimistic and for these agreements to be a valid instrument for moving forward with association.

I think that the alliance of civilisations is a valid instrument in the fight against terrorism.

The Schengen Information System has proved itself an excellent and valid instrument for management and control within the European Union.

This is a reliable and valid instrument that has been used in a variety of studies.