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Bearing in mind that no rules can be laid down to which no exceptions can be found, the committee believes that if the recommendations below are followed, the presentations will contain the essential information for a majority of the uses made of A.S.T.M. data. Recommendations for Presentation of Data.—Given a set of n observations of a single variable obtained under the same essential conditions: 1. Present as a minimum, the average, the standard deviation, and the number of observations. Always state the number of observations. 2. If the number of observations is large and if it is desired to give information regarding the shape of the distribution, present also the value of the skewness k, or present a grouped frequency distribution. 3. If the data were not obtained under controlled conditions and it is desired to give information regarding the extreme observed effects of assignable causes, present the values of the maximum and minimum observations in addition to the average, the standard deviation, and the number of observations. 4. Present as much evidence as possible that the data were obtained under controlled conditions. 5. Present relevant information on precisely (a) the field within which the measurements are supposed to hold and (b) the conditions under which they were made.