A comparison of the indexing on Eric and Lisa of the three journals devoted to online searching, Online, Online Review and Database, revealed some differences, but a greater number of similarities. On average, Lisa assigned more terms/document but Eric indexed more concepts/document. A critical subset of the vocabulary which distinguished online searching (a small number of terms used frequently) did emerge for each, but there were no exact matches in the terminology of the two systems. Several words within the multi‐ word phrases, however, were the same. For both systems, at least one term from the critical subset had been assigned to more than half the articles in the sample. Further, in each system, a single term had been assigned to more than eighty percent of the sample.
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Verbeck et al. (1987) studied this question.
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