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Those standards under the jurisdiction of ASTM Committee D-4 on Road and Paving Materials which deal with bitumens or bituminous compositions have been examined with respect to the adequacy of their precision claims. In many cases, precision statements are found to be inadequate in form, clarity, and coverage. Each method of test should include a precision statement which would specify (a) the range within which repeated determinations by the same operator on the same apparatus (repeatability) should agree; (b) the range within which check determinations by different operators on different sets of apparatus (reproducibility) should agree; and (c) the confidence level at which these ranges apply. It is recommended that Committee D-4 use a standard form of precision statement; that the inclusion of such be a requisite for every method of test; and that adequate supporting data be published or otherwise filed for ready availability.
Brown, A. B.
Standard Oil Co. (Indiana), Whiting, Ind.