Understanding & Choosing Appropriate Sources
THE INFORMATION LIFECYCLE:
The Information Lifecycle helps us understand how information about an event, topic or idea might emerge and evolve over time.
Note that this timeline is just a general sense of the information lifecycle -- the exact timing can vary greatly from one discipline to another!
SCHOLARLY & POPULAR SOURCES:
Scholarly sources are written by experts on a particular subject (for example, a professor or other researcher). They also go through an extra process of review and approval by a group of other experts before they can be published. Usually, scholarly articles are written in 'academic-ese' and designed to be read by other scholars. However, because scholarly sources take a long time to be approved and published, they are not always good sources for current events.
How can you tell if you have a scholarly article in your hand?
The chart below compares the characteristics of scholarly vs. popular (non-scholarly) sources: 
| popular | scholarly | |
|---|---|---|
| author | Usually staff writers and/or journalists | Experts on the topic -- usually researchers, scholars and/or professors |
| audience | General public (for "popular" consumption) | Other experts (and students) in the field |
| editing & review | Editor(s); generally concerned with grammar, style, etc., with some fact-checking | Other experts ("peer reviewed"); generally concerned with quality, thoroughness of research, strength of argument, etc. |
| style & design |
Reasonably brief, typically uses colloquial if not informal language. Often illustrated with graphics, sidebars and other aesthetic elements. Sometimes accompanied by ads. |
More extensive in length; tends to be more formal and uses specialized vocabulary. Illustrations and charts are used only when furthering content. |
| goal or purpose | To entertain; and/or, to share general information | To share findings, advance and argument and/or engage with other scholars |
| sources | Few or none; if sources are used, there may not be formal citations. | Typically uses many sources, cited in detailed bibliographies, footnotes and/or endnotes |
| examples | Time Magazine; Sports Illustrated; New Yorker; Boston Globe | Annual Review of Political Science; American Historical Review; Sociology of Education |
It's important to keep in mind that scholarly sources are not always the best or only source available to you -- it depends on what information you are trying to find:
- Due to the time required for a scholarly article to be researched, written, go through the peer review process and then be published, it can be difficult to find scholarly articles published about recent events, discoveries, etc.. You should expect 1-2 years between the time an event occurs and the time academic research on that event begins to be published, with some exceptions.
- News articles, correspondence and other 'primary sources' can also provide useful insights, again depending on your topic.
PRIMARY & SECONDARY SOURCES:
A primary source is a first-hand witness to a historical event or period (that is, it was originally created at that point in history). Primary sources offer a first-hand perspective which is untouched by hindsight, subsequent events, or modern knowledge. They provide insights about the actions, motivations and emotions involved in a historical period, and allow us to understand history as it was experienced at the time rather than as we analyze it today.
Unlike with secondary sources, the value of primary sources lies in their proximity to the event rather than a particular publication venue and/or authority (though this can also play a role in your interpretation of the source). For this reason, primary sources may include a combination of scholarly, popular, unpublished, and other kinds of sources.
Secondary sources are second-hand witnesses -- they provide descriptions and/or analysis of historical events and documents after the fact. Secondary sources usually draw their information from primary sources, but add a layer of interpretation, and often rely upon the kind of understanding of historical periods and/or events that only becomes clear sometime later. 
| primary | secondary | |
|---|---|---|
| author | A first-hand witness to a historical event or period | A second-hand witness who interprets first-hand information using later understanding of events |
| date | Typically, but not always, published in or near the relevant time period or event. Exceptions can include memoirs or compilations, translations, etc. published at a later date. | Typically removed in time from the relevant period/event |
| original purpose | Varies widely. Typically not intentionally created for sake of history or research. | Varies; usually, to convey information or analysis |
| research use |
Offers first-hand perspectives untouched by hindsight or modern knowledge |
Offers descriptions, and/or analysis of historical events after the fact; may also offer synthesis of first-hand information. |
| publication format | Varies; can include nearly anything from an object to a scholarly article [if from the appropriate period] | Typically "published" sources -- books, journal articles, magazines/newspapers |
| examples | NYT article from April 1912 [Titanic], 1963 book on the USSR [Cold War], George Washington's collected papers [Colonial America/Revolution] | American Historical Review; current NYT articles; a book published in 2018 |
