More than one million citations from the scientific literature have been processed by the Citation Index Project at the Institute for Scientific Information. The Project, sponsored by NSF and NIH, will be described briefly, and new methods of using citation data for evaluation of publications will be discussed. Summaries of statistical data, compiled by computer methods such as the following, will be given. Frequency of citation of one journal by another. Frequency of current citations to the past literature. Frequency of self‐citation by journals and authors. Number of source citations per cited paper. Number of references per source paper. Number of papers published per journal. Information scientists and research workers are encouraged to use this unique reservoir of information for additional statistics applicable to their fields of work as a basis for comparative studies on the efficacy of various indexing techniques.

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the two processings are compared in detail. This procedure enables identification of the types, causes, and sources of undetected errors. The sampling procedure is not designed for the detection of errors. The fact that it does detect them is purely incidental.As users of chemical information we understandably desire the elimination of all errors in both primary and secondary publications. However, as representatives of an organization which must recover the costs incurred in producing its publications, we must concede that some errors will exist in the published literature. CAS is striving, wherever possible, to reduce the number of errors in its publications and to make appropriate reference to errors which are detected in the primary literature we cover.

Citation indexing serves as the basis for a large-scale person alized reference system offered on a subscription basis by the Institute for Scientific Information in Philadelphia, Pennsylva nia. Dr. Eugene Garfield is President of ISI and Irving Sher is Vice-President in charge of Research and Development.