Symbols for bibliometric concepts like "half life,""impact factor,""normalized impact factor," and "immediacy index" are proposed and formulas for the determination of their values are provided. The features of the bibliometric concepts are also highlighted. (Author/AEF)

This review of the literature discusses theories of information with emphasis on the views of Dervin and Popper on subjectivity and objectivity as they relate to information use. Classification and indexing as applied in information retrieval systems and libraries are also discussed, and 78 references are provided. (LRW)