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One of the most important authors in the indexing field, Jacques Chaumier, defined indexing as both a means and an end. From the former perspective, indexing is the description and characterization of a document's contents, with descriptions of the concepts it contains; however, its ultimate purpose is to enable the information stored in the system to be recovered. In other words, like many other authors Chaumier considers indexing to be the prerequisite for the adequate recovery of information (Rodriguez Perojo et al., 2006, as cited in Chaumier, 1986). The process of searching for information must consist of a series of ordered steps that have to be followed when searching for the answer to a question, especially in the literature. However, a command of the vocabulary used is one of the determinant factors for success when searching for information, in terms of both describing and recovering articles of interest. Based on the idea that information is the essential ingredient of knowledge, the bibliographical search is one of the essential parts of all thorough research work. A study is not only documented by its bibliography, but the bibliography is often also its firmest foundation and the best guarantee of its relevance. Knowledge of the existing reference works and their contents is the first requirement for solving any problem of information that arises in any professional activity. However, in order to make a truly effective use of them, it is necessary to be aware of the logical procedures that lead to satisfactory results. This need has contributed to the rapid development of Information Recovery as an increasingly complex technique requiring knowledge of indexing languages. It is related to Documentation Sciences and Computing, and covers a clearly defined subject area (in this case Eating Disorders as part of Health Sciences) which includes procedures for the selection of documents, techniques for their dissemination and description and the various ways in which their files can be accessed.

Appropriateness and Adequacy of the Keywords Listed in Papers Published in Eating Disorders Journals Indexed Using the MEDLINE Database