Just as in medical research, social scientists are concerned with the correct classification of individuals into well defined categories. Many economic policy decisions rely on the unemployment rate and related labor statistics. As the unemployment rate is the ratio of the estimated number of unemployed persons to the total labor force, misclassification of survey respondents may lead to an under or over estimate of it. Thus, estimating the accuracy of the original interview is quite important and the Census Bureau conducts a special reinterview study of about 20,000 respondents per year to monitor their error rates. In law, a large body of research (Hans and Vidmar; 1991, Blank and Rosenthal; 1991) has raised questions about how well the jury functions. The basic problem can be placed in the classification frame work. How well does the current system perform in correctly determining that a guilty party is found guilty and in not convicting an individual who should be acquitted ? This article reports some exploratory work we have carried out on extending and modifying the Hui-Walter methodology for evaluating the accuracy of diagnostic tests (see Vianna, 1995, for related work) to enable us to estimate the accuracy of the labor force data and to reanalyze a classic study (Kalven and Zeisel, 1966) of judge-jury agreements to estimate the accuracy of jury verdicts.