One of the most economical and quickest ways to discover hypotheses is the work of others, through a literature search. For this purpose, a large volume of published and unpublished data are available which can be scanned in a relatively small period of time. More useful sources of such information are books, newspapers government documents, trade journals, professional journals, and so on. These are available in libraries; company records such as those dept for accounting and sales analysis purposes; reports of associations related to the area of interest.

For example, problem for research in particular soft  drinks company may be “sales are off, why?” For solving it, second data from the above sources can be analyzed. These data my be sufficient to solve the problem completely but will be of great help to provide a direction to further research.

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