"evaluate, v. a. Mathematics. To work out the ‘value’ of (a quantitative expression); to find a numerical expression for (any quantitative fact or relation). b. gen. To ‘reckon up’, ascertain the amount of; to express in terms of something already known." OED
Evaluating sources is an important step in the research process. Once you have found information (articles, books, etc.), it is important to evaluate those sources to determine whether they are something you will want to use in your assignment, if they are reliable, and how they relate to your assignment.
For example: Primary sources provide direct, firsthand evidence about an event, object, or person (e.g. manuscript, interview, scientific research results), while secondary sources are a secondhand account or interpretation of an event, object or person (journal articles, textbooks, interpretation of data).—Taken from "Evaluating Sources."
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