The Maternal Tolerance Scale has consistently proved valuable in predicting those mothers who prematurely withdraw their children from treatment for nocturnal enuresis. This study sought to replicate the original work in examining the structure of the scale with an independent group of mothers. The results show the scale to have cross validity, although it appears weighted towards measuring intolerance rather than tolerance. A factor analysis produced 6 factors and these are discussed with regard to possible pathways leading to the development of intolerance.