Abstract
After collecting a large number of performance rating assessments in order to enable a sot of rating films to be used for training purposes it was decided to analyse the results. This analysis shows that the basic limitations of the rating process still exist and the article discusses two of these in detail. Flatness is seen to be even more pronounced than had heretofore been acknowledged and the variability in concept of standard is seen to be approximately half explained by differences between companies and half by differences between observers within the same company.

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