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Sources of information are commonly categorized as primary, secondary, or tertiary sources.In brief, a primary source is one close to the event with firsthand knowledge (for example, an eyewitness); a secondary source is at least one step removed (for example, a book about an event written by someone not involved in it); and a tertiary source is an encyclopaedia or textbook that provides a ...
A tertiary source is an index or textual consolidation of already published primary and secondary sources [1] that does not provide additional interpretations or analysis of the sources. [2] [3] Some tertiary sources can be used as an aid to find key (seminal) sources, key terms, general common knowledge [4] and established mainstream science on a
Tertiary sources are publications such as encyclopedias and other compendia that summarize primary and secondary sources. Wikipedia is a bad source. While it is a tertiary source, Wikipedia is not considered a reliable source for Wikipedia articles. Tertiary sources can provide a valuable overview of a topic, but often oversimplify complex ...
A primary source can have all of these qualities, and a secondary source may have none of them. Deciding whether primary, secondary or tertiary sources are appropriate on any given occasion is a matter of good editorial judgment and common sense, not merely mindless, knee-jerk reactions to classification of a source as "primary" or "secondary".
Secondary sources may draw on primary sources and other secondary sources to create a general overview; or to make analytic or synthetic claims. [3] [4] Tertiary sources are publications such as encyclopedias or other compendia that sum up secondary and primary sources. For example, Wikipedia itself is a tertiary source.
Many sources contain a combination of primary/secondary or secondary/tertiary material, sometimes all three. A source that is secondary in one context may be primary in another (e.g. a history book is a secondary source for the facts it reports, but a primary source for what the author wrote about an event).
The medium is not the message; source evaluation is an evaluation of content, not publication format. Sometimes high-quality, generally tertiary individual sources are also primary or secondary sources for some material. Two examples are etymological research that is the original work of a dictionary's staff (primary); and analytical not just regurgitative material in a topical encycl
The definition of a primary source varies depending upon the academic discipline and the context in which it is used. In the humanities, a primary source could be defined as something that was created either during the time period being studied or afterward by individuals reflecting on their involvement in the events of that time.