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Performing an information search starts with choosing a search strategy and familiarising oneself with the instructions and tools of the databases that are going to be used. When using a search string, the concepts of the subject matter should be described with alternative terms, parallel concepts and synonyms. Search terms with their truncation symbols and the operators connecting them form the search string, the presentation of which varies according the database. In the pearl growing strategy, the starting point is a relevant document which is used to find more literature on the subject. From the reference information in articles, more articles dealing with the same topic can be searched using the article that has already been found to be relevant. It is also possible to discover the interest an article has generated, and furthermore one can follow the development and impact of the research results and scientific theories.