Trace information in all directions through time and space. Each search strategy has different strengths and weaknesses, and will uncover a somewhat different set of information.
Later in this chapter, we will discuss computerized searches in some detail. However, the idea of networking pre-dates computer-based searches. For example, a time-honored search strategy called the Ancestry Approach starts by acquiring a research report and examining its references to find other relevant references. Through reiteration, researchers work their way back through the literature until either the important concepts disappear or the studies become so old they can be judged obsolete.
A more recent set of searching tools employs the Descendency Approach. Citation indexes identify a publication's offspring - those more recent books and journal articles that reference the earlier work.
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