The Garfield impact factor, one of the fundamental indicators in scientometrics

The paper summarizes some basic features of the Garfield impact factor (GF). Accordingly, GF should be regarded as a scientometric indicator representing the relative contribution of journals to the total impact of information in a field. For calculating GF, both from theoretical and practical reasons the “ratio of the sums” method is recommended over the “mean of the ratios” method. Scientific advances are made by the most influential, presumably most frequently cited articles. The distribution of citations among the publications is skewed in journals. Consequently, the GF index will be influenced primarily by the highly cited papers. It follows, GF represents the most valuable part of the information in journals quantitatively, and even therefore it may be regarded as a reliable impact indicator.