• 1 January 1980
    • journal article
    • research article
Abstract
The accuracy of results from any epidemiological project depends on the performance of all stages of data collection and handling. One link in this chain may involve microscopic inspection of specimens; this article describes means of assessing the accuracy of this stage. Two aspects merit consideration: the design of a sampling system and the collection and interpretation of the results. The importance of design is stressed but the considerable variation in individual circumstances rules out a full treatment of the topic. A method of record keeping is described together with a method of graphical presentation of results. A procedure is outlined for detecting unacceptable performances and some of the statistical considerations are discussed.