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In scholarship, a secondary source〔"(Primary, secondary and tertiary sources )". University Libraries, University of Maryland.〕〔"(Secondary sources )". James Cook University.〕 is a document or recording that relates or discusses information originally presented elsewhere. A secondary source contrasts with a primary source, which is an original source of the information being discussed; a primary source can be a person with direct knowledge of a situation, or a document created by such a person. However, as discussed in detail in the section below on classification, how to classify a source is not always an obvious decision. Secondary sources involve generalization, analysis, synthesis, interpretation, or evaluation of the original information. ''Primary'' and ''secondary'' are relative terms, and some sources may be classified as primary or secondary, depending on how it is used.〔"(Primary and secondary sources )". Ithaca College Library.〕〔,〕 A third level, the tertiary source, such as an encyclopedia or dictionary, resembles a secondary source in that it contains analysis, but attempts to provide a broad introductory overview of a topic.〔Richard Veit and Christopher Gould, ''Writing, Reading, and Research'' (8th ed. 2009) p 335〕〔 ==Classification== Many sources can be considered either primary or secondary, depending on the context in which they are used.〔.〕 Moreover, the distinction between ''primary'' and ''secondary'' sources is subjective and contextual,〔.〕 so that precise definitions are difficult to make.〔.〕 For example, if a historical text discusses old documents to derive a new historical conclusion, it is considered to be a primary source for the new conclusion, but a secondary source of information found in the old documents. Other examples in which a source can be both primary and secondary include an obituary or a survey of several volumes of a journal counting the frequency of articles on a certain topic.〔 Whether a source is regarded as primary or secondary in a given context may change, depending upon the present state of knowledge within the field. For example, if a document refers to the contents of a previous but undiscovered letter, that document may be considered "primary", since it is the closest known thing to an original source, but if the letter is later found, it may then be considered "secondary".〔.〕 Attempts to map or model scientific and scholarly communication need the concepts of primary, secondary and further "levels". One such model is the UNISIST model of information dissemination. Within such a model these concepts are defined in relation to each other, and the acceptance of this way of defining the concepts are connected to the acceptance of the model. Some other modern languages use more than one word for the English word "source". German usually uses ''Sekundärliteratur'' ("secondary literature") for secondary sources for historical facts, leaving ''Sekundärquelle'' ("secondary source") to historiography. A ''Sekundärquelle'' is a source which can tell about a lost ''Primärquelle'' ("primary source"), such as a letter quoting from minutes which are no longer known to exist, so cannot be consulted by the historian. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「secondary source」の詳細全文を読む スポンサード リンク
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