f two inspectors classify items in a lot into m classes, it is possible that each of them makes wrong classification in some cases, thus causing bias. Expressions have been obtained for the limits of this bias in estimating the proportion of the different classes. From the results of the classification they obtained limit for the estimates of Proportions have been worked out, based on assumption regarding the magnitudes of probabilities of misclassification. Now we suppose that is the probability that t the inspector classifies correctly an item in class and is the probability that he misclassifies in an item actually belonging to , therefor, An estimate for the proportion of the class in the lot would be The % Bias in proportion is