Research methodology and applied statistics. Part 2: the literature search

This paper presents a basic methodology for an effective and efficient retrieval and recording of written materials in a subject area. The purpose of the literature review is examined and the criteria for selection of materials for inclusion are outlined. The methodology then describes the role of the librarian, various types of information resources, how to choose appropriate indexing and abstracting services, and a simple efficient method of recording the items found. The importance and use of Medical Subject Headings for research in physiotherapy is emphasized. A survey of types of book materials and how to locate them is followed by a detailed description of the most useful indexing and abstracting services available, in particular, the publications of the National Library of Medicine, notably Index Medicus, as well as Excerpta Medica and the Science Citation Index. A discussion of on-line search services, their coverage and availability in Canada, concludes the review of information sources. Finally, guidelines for selecting and summarizing the materials located and comments on the literary style for a review are supplied.