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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".
This wall painting found in the Roman city of Pompeii is an example of a primary source about people in Pompeii in Roman times (portrait of Terentius Neo).. In the study of history as an academic discipline, a primary source (also called an original source) is an artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was created at the time ...
A primary source in science is one where the authors directly participated in the research. They filled the test tubes, analyzed the data, or designed the particle accelerator, or at least supervised those who did. Many, but not all, journal articles are primary sources—particularly original research articles. An appropriate primary source is ...
A primary source is one in which the authors directly participated in the research and documented their personal experiences. They examined the patients, injected the rats, ran the experiments, or supervised those who did. Many papers published in medical journals are primary sources for facts about the research and discoveries made.
Historians carry out original research, often using primary sources. Historians often have a PhD or advanced academic training in historiography, but may have an advanced degree in a related social science field or a domain specific field; other scholars and reliable sources will typically use the descriptive label historian to refer to an historian.
An account of a traffic incident written by a witness is a primary source of information about the event; similarly, a scientific paper documenting a new experiment conducted by the author is a primary source for the outcome of that experiment. For Wikipedia's purposes, breaking news stories are also considered to be primary sources. Historical ...
Isolated studies – Isolated studies are usually considered tentative and may change in the light of further academic research. If the isolated study is a primary source, it should generally not be used if there are secondary sources that cover the same content. The reliability of a single study depends on the field.
Sources that are reliable for some material are not reliable for other material. For instance, otherwise unreliable self-published sources are usually acceptable to support uncontroversial information about the source's author. You should always try to use the best possible source, particularly when writing about living people.