A final question concerns the content validity of the QWB. This is reliant upon the scenarios used to develop the QWB containing accurate representations of the range of possible conditions, or at least a reasonable sub set. The value of the global ratings elicited by the scenarios is limited by the comprehensiveness/accuracy of scenario descriptions as well as the knowledge of raters. The gaining of a correlation between arthritis sufferers and the general public on the same scenarios seems more a test of reliability than validity, and it cannot be assumed that content validity has been satisfied.