From surveys conducted by the authors it is concluded that the best and most acceptable quality control methods in cytology are those from within the laboratory. Most of these have results which can be reported centrally. Where the overall control and codes of practice are high, there the results are the most reliable, as sources of error from whatever cause are quickly brought to light. These conclusions are illustrated by data from the five centres and correlated in the tables.
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↵1 This is a compilation of data from a lecture given to the Royal College of Pathologists on 2 May 1973 by O.A.N.H. and a symposium on quality control given at the British Society for Clinical Cytology meeting on 28 September 1973 in the Hammersmith Hospital by all authors. A paper by Evans et al presented elsewhere in this journal was embodied in the symposium.