User:SlimVirgin/VNOR

The threshold for inclusion in Wikipedia is verifiability, not truth: whether readers can check that material in Wikipedia has already been published by a reliable source, not whether editors think it is true.

To show that it is not original research, all material added to articles must be attributable to a reliable published source. In practice you do not need to attribute everything; only quotations and material challenged or likely to be challenged must be attributed, through an inline citation which directly supports the material in question. For how to write citations, see Citing sources.

This policy applies to all material in the mainspace—articles, lists, sections of articles, and captions—without exception, and in particular to material about living persons. Anything that requires but lacks a source may be removed, and unsourced contentious material about living persons must be removed immediately.

Verifiability is one of Wikipedia's two core content policies, along with Neutral point of view. These policies jointly determine the type and quality of material that is acceptable in articles. They should not be interpreted in isolation from one another, and editors should familiarize themselves with the key points of all three. Articles must also comply with the copyright policy.

Anything challenged or likely to be challenged
All quotations and any material challenged or likely to be challenged must be attributed to a reliable published source using an inline citation. Cite the source clearly and precisely, with page numbers where appropriate. (Be mindful of copyright and plagiarism. Read the sources, understand and internalize them, then summarize them in your own words. When paraphrasing closely or quoting, use in-text attribution.)

Burden of evidence
The burden of evidence lies with the editor who adds or restores material. You may remove any material lacking a reliable source that directly supports it. How quickly this should happen depends on the material and the overall state of the article. Editors might object if you remove material without giving them time to provide references. It has always been good practice to make reasonable efforts to find supporting sources yourself and cite them. Do not leave unsourced or poorly sourced material in an article if it might damage the reputation of living people; see here for how the BLP policy applies to groups.

What counts as a reliable source
The word "source" in Wikipedia has three meanings: the piece of work itself (a document, article, paper, or book), the creator of the work (for example, the writer), and the publisher of the work (for example, The New York Times). All three can affect reliability.

Base articles on reliable, third-party, published sources with a reputation for fact-checking and accuracy. Source material must have been published (made available to the public in some form); unpublished materials are not considered reliable. Sources should directly support the material presented in an article and should be appropriate to the claims made. The appropriateness of any source depends on the context. In general, the best sources have a professional structure in place for checking or analyzing facts, legal issues, evidence, and arguments; as a rule of thumb, the greater the degree of scrutiny given to these issues, the more reliable the source.

Where available, academic and peer-reviewed publications are usually the most reliable sources, such as in history, medicine, and science. But they are not the only reliable sources in such areas. Material from reliable non-academic sources may also be used, particularly if it appears in respected mainstream publications. Other reliable sources include university-level textbooks, books published by respected publishing houses, magazines, journals, and mainstream newspapers. Electronic media may also be used, subject to the same criteria.

Primary, secondary and tertiary sources
Wikipedia articles should be based on reliable secondary sources and, to a lesser extent, on tertiary sources. Secondary or tertiary sources are needed to establish the topic's notability and to avoid novel interpretations of primary sources, though primary sources are permitted if used carefully. All interpretive claims, analyses, or synthetic claims about primary sources must be referenced to a secondary source, rather than original analysis of the primary-source material by Wikipedia editors.

Appropriate sourcing can be a complicated issue, and these are general rules. Deciding whether primary, secondary or tertiary sources are appropriate on any given occasion is a matter of editorial judgment. For the purposes of this policy, primary, secondary and tertiary sources are defined as follows:


 * Primary sources are close to an event, often accounts written by people who are directly involved, offering an insider's view of an event. An account of a traffic accident written by a witness is a primary source of information about the accident. Historical documents such as diaries are primary sources.


 * Primary sources that have been reliably published may be used in Wikipedia, but only with care, because it is easy to misuse them. Any interpretation of primary source material requires a reliable secondary source for that interpretation. A primary source may only be used on Wikipedia to make straightforward, descriptive statements that any educated person, with access to the source but without specialist knowledge, will be able to verify are supported by the source. For example, an article about a novel may cite passages to describe the plot, but any interpretation needs a secondary source. Do not analyze, synthesize, interpret, or evaluate material found in a primary source yourself; instead, refer to reliable secondary sources that do so. Do not base articles entirely on primary sources. Use extra caution when handling primary sources about living people; see WP:BLPPRIMARY, which is policy.


 * Secondary sources are second-hand accounts, at least one step removed from an event. They rely on primary sources for their material, often making analytic or evaluative claims about them. For example, a review article that analyzes research papers in a field is a secondary source for the research. Whether a source is primary or secondary depends on context. A book by a military historian about the Second World War might be a secondary source of material about the war, but if it includes details of the author's own war experiences, it would be a primary source of material about those experiences.


 * Wikipedia articles usually rely on material from secondary sources. Articles may make analytic or evaluative claims only if these have been published by a reliable secondary source.


 * Tertiary sources are publications such as encyclopedias or other compendia that summarize mainly secondary sources. Wikipedia is a tertiary source. Many introductory undergraduate-level textbooks are regarded as tertiary sources because they sum up multiple secondary sources.


 * High-quality tertiary sources can be helpful in providing broad summaries of topics that involve many primary and secondary sources, especially when those sources contradict each other. Wikipedia articles may not be used as sources in other Wikipedia articles, but are sometimes used as primary sources in articles about Wikipedia itself.

Newspaper and magazine blogs
Several newspapers host columns that they call blogs. These are acceptable as sources if the writers are professionals and the blog is subject to the newspaper's full editorial control. In March 2010, the Press Complaints Commission in the UK ruled that journalists' blogs hosted on the websites of newspapers or magazines are subject to the same standards expected of comment pieces in that organization's print editions. Where a news organization publishes an opinion piece, attribute the writer (e.g. "Jane Smith has suggested..."). Never use posts left by readers as sources. For blogs that are not reliable sources, see below.

Reliable sources noticeboard and WP:IRS
To discuss the reliability of a specific source for a particular statement, consult the reliable sources noticeboard, which seeks to apply this policy to particular cases. For a guideline discussing the reliability of particular types of sources, see Identifying reliable sources (WP:IRS). In the case of inconsistency between this policy and the WP:IRS guideline, or any other guideline related to sourcing, the policy has priority.

Questionable sources
Questionable sources are those with a poor reputation for checking the facts, or with no editorial oversight. Such sources include websites and publications expressing views that are widely acknowledged as extremist, or promotional, or which rely heavily on rumor and personal opinion. Questionable sources should be used only as sources of material on themselves, especially in articles about themselves; see below. They are generally unsuitable for citing contentious claims about third parties.

Self-published sources
Anyone can create a personal web page or pay to have a book published, then claim to be an expert in a certain field. For that reason, self-published media, such as books, patents, newsletters, personal websites, open wikis, personal or group blogs, Internet forum postings, and tweets, are largely not acceptable as sources. Self-published expert sources may be considered reliable when produced by an established expert on the topic of the article whose work in the relevant field has previously been published by reliable third-party publications. Take care when using such sources: if the information in question is really worth reporting, someone else will probably have done so.

Never use self-published sources as third-party sources about living people, even if the author is an expert, well-known professional researcher, or writer.

Self-published or questionable sources as sources on themselves
Self-published and questionable sources may be used as sources of information about themselves, usually in articles about themselves or their activities, without the requirement in the case of self-published sources that they be published experts in the field, so long as:


 * 1) the material is not unduly self-serving;
 * 2) it does not involve claims about third parties;
 * 3) it does not involve claims about events not directly related to the source;
 * 4) there is no reasonable doubt as to its authenticity;
 * 5) the article is not based primarily on such sources.

Social media
In addition to the limitations listed above, pages on social networking sites such as Twitter or Facebook should only be used to support personal information about subjects—in articles about those subjects—if the page is confirmed by another source, such as the subject's website, as belonging to the subject. When such authentication is not possible, pages on social networking sites should not be used.

Wikipedia and sources that mirror or use it
Articles on Wikipedia or on websites that mirror its content should not be used as sources, because this would amount to self-reference. Similarly, editors should not use sources that present material originating from Wikipedia to support that same material in Wikipedia, as this would create circular sourcing&mdash;Wikipedia citing a source that derives its material from Wikipedia. Wikipedia may be cited with caution as a primary source of information on itself, such as in articles about itself.

Synthesis of published material that advances a position
Do not combine material from multiple sources to reach or imply a conclusion not explicitly stated by any of the sources. If one reliable source says A, and another reliable source says B, do not join A and B together to imply a conclusion C that is not mentioned by either of the sources. This would be a synthesis of published material to advance a new position, which is original research. "A and B, therefore C" is acceptable only if a reliable source has published the same argument in relation to the topic of the article.


 * A simple example of original synthesis:


 * Both parts of the sentence may be reliably sourced, but here they have been combined to imply that the UN has failed to maintain world peace. If no reliable source has combined the material in this way, it is original research. It would be a simple matter to imply the opposite using the same material, illustrating how easily material can be manipulated when the sources are not adhered to:


 * The following is a more complex example of original synthesis, based on an actual Wikipedia article about a dispute between two authors, here called Smith and Jones. The first paragraph is fine, because each of the sentences is carefully sourced, using a source that refers to this dispute:


 * Now comes the original synthesis:

The second paragraph is original research because it expresses a Wikipedia editor's opinion that, given the Harvard manual's definition of plagiarism, Jones did not commit it. To make the second paragraph consistent with this policy, a reliable source would be needed that specifically comments on the Smith and Jones dispute and makes the same point about the Harvard manual and plagiarism. In other words, that precise analysis must have been published by a reliable source in relation to the topic before it can be published on Wikipedia.

Access to sources
Verifiability in this context means anyone should be able to check that material in a Wikipedia article has already been published by a reliable source. The principle of verifiability implies nothing about ease of access to sources: some online sources may require payment, while some print sources may be available only in university libraries. WikiProject Resource Exchange may be able to assist in obtaining source material.

Non-English sources
Because this is the English Wikipedia, English-language sources are preferred over non-English ones, provided that English sources of equal quality and relevance are available. When quoting a source in a different language, provide both the original-language text and an English translation in the text or a footnote. Translations published by reliable sources are preferred over translations by Wikipedians, but translations by Wikipedians are preferred over machine translations. When citing such a source without quoting it, the original and its translation should be provided if requested by other editors: this can be added to a footnote or the talk page. When posting original source material, editors should be careful not to violate copyright; see the fair-use guideline.

Tagging a sentence, section, or article
If you want to request a source for an unsourced statement, consider tagging a sentence with the citation needed template by writing cn or fact. Other templates are available here for tagging sections or entire articles. Alternatively, leave a note on the talk page requesting a source, or move the material there. To request verification that a reference supports the text, tag it with verification needed. Material that fails verification may be tagged with failed verification or removed. Unsourced or poorly sourced contentious material about living people should be removed immediately and not tagged or moved to the talk page.

Original images
Because of copyright laws in a number of countries, there are relatively few images available for use in Wikipedia. Editors are therefore encouraged to upload their own images, releasing them under the GFDL, CC-BY-SA, or other free licenses. Original images created by a Wikipedian are not considered original research, so long as they do not illustrate or introduce unpublished ideas or arguments, the core reason behind the NOR policy. Image captions are subject to this policy no less than statements in the body of the article. It is not acceptable for an editor to use photo manipulation to distort the facts or position illustrated by an image. Manipulated images should be prominently noted as such. Any manipulated image where the encyclopedic value is materially affected should be posted to Files for deletion. Images of living persons must not present the subject in a false or disparaging light.

Translations, transcriptions, routine calculations
Faithfully translating sourced material into English, or transcribing spoken words from audio or video sources, is not considered original research. For information on how to handle sources that require translation, see Verifiability.

This policy allows routine mathematical calculations, such as adding numbers, converting units, or calculating a person's age, provided editors agree that the arithmetic and its application correctly reflect the sources. See also Category:Conversion templates.

Notability
If no reliable third-party sources can be found on a topic, Wikipedia should not have an article on it.

Exceptional claims require exceptional sources
Exceptional claims require high-quality sources. Red flags that should prompt extra caution include:
 * surprising or apparently important claims not covered by mainstream sources;
 * reports of a statement by someone that seems out of character, or against an interest they had previously defended;
 * claims that are contradicted by the prevailing view within the relevant community, or that would significantly alter mainstream assumptions, especially in science, medicine, history, politics, and biographies of living people. This is especially true when proponents say there is a conspiracy to silence them.

Neutrality
All articles must adhere to the Neutral point of view policy (NPOV), fairly representing all majority and significant-minority viewpoints published by reliable sources, in rough proportion to the prominence of each view. Tiny-minority views need not be included, except in articles devoted to them. Where there is disagreement between sources, use in-text attribution: "John Smith argues that X, while Paul Jones maintains that Y," followed by an inline citation. Sources themselves do not need to maintain a neutral point of view; indeed most reliable sources are not neutral. Our job as editors is simply to present what the reliable sources say.