Differences Between Primary and Secondary Sources Compared

, Content Lead
Updated June 2, 2021
College student performing research in the library
    College student performing research in the library
    Used under license / Getty Images / Frank and Helena

Whether you are in the process of writing a research essay for school or you're drafting a persuasive opinion article for the student newspaper, you'll want to support your assertions with appropriate sources. This adds credibility to your writing because it means that you're not pulling ideas and facts out of thin air.

Generally speaking, you'll find that these sources come in one of two types: primary sources vs. secondary sources. What's the difference between the two? Primary sources are typically the raw materials or the original content, providing a first-hand account of the events. Secondary sources, on the other hand, are one step removed from the original content. Sometimes, they'll analyze, restate, or describe the contents of primary sources.

Both primary and secondary sources have their place. They also have their respective pros and cons. Let's look into the role of primary sources vs. secondary sources.


Primary Sources

A primary source is an original document or other piece of material that was created at the time of the actual events or within its time period. The material is ideally created by someone who is known and can be named, and it was produced for a known purpose.

In other words, a primary source is the raw material that is produced from a first-hand account or as close to a first-hand account as is available. The transcript of an interview with an eyewitness is still considered a primary source.

Examples of Primary Sources

Some examples of primary sources include the following.

  • Original manuscripts
  • Audio recordings
  • Research articles published in peer-reviewed journals
  • Original documents and artifacts
  • Personal diaries, letters, emails
  • Autobiographies
  • Photographs and video recordings
  • Meeting minutes
  • Survey results
  • Newspaper articles with original reporting
  • Original research reports

In this way, a book like The Diary of Anne Frank is considered a primary source. So are the Declaration of Independence and photographs recovered from the Vietnam War.


Advantages of Primary Sources

The biggest advantage of referring to a primary source is that you can have confidence in knowing that the original material is untarnished and intact. It has not been misinterpreted by outside parties, because you're getting the story straight from the horse's mouth.

The material can generally be tracked and attributed back to the original creator, giving much more weight to the points being referenced. You are less subject to subsequent misinterpretations and assumptions made after the fact.

Disadvantages of Primary Sources

As powerful as primary sources may be, they may also be incomplete or unusable. For example, if the writing or audio recording is in another language that you do not speak, you wouldn't understand anything being said. And even if it is in English, you may not have enough context to grasp the full extent of what is being said.

When you rely solely on primary sources, you are also relying solely on your own knowledge and interpretation. That may not be sufficient in really extracting as much value as possible out of the original materials.


Secondary Sources

Whereas primary sources are generally the original material, a secondary source builds upon one or more primary sources. Often, secondary sources will interpret, analyze, explain or describe content from primary sources.

In some cases, secondary sources can attempt to remain reasonably neutral in their presentation of the facts. In other cases, secondary sources can use them to argue a point or try to persuade the reader of a particular opinion.

Examples of Secondary Sources

Common examples of secondary sources include the following:

  • Scholarly or critical analysis
  • Commentary or editorial content
  • Textbooks
  • Encyclopedias
  • Biographies
  • Magazine articles (particularly opinion pieces)
  • Documentary films
  • Second-hand news reporting

So, while The Diary of Anne Frank is a primary source, a book that analyzes Frank's diary and provides more historical context for its entries would be considered a secondary source. Similarly, an autobiography written by Barack Obama is a primary source, but a biography written by someone else about Barack Obama would be considered a secondary source.


Advantages of Secondary Sources

Unsurprisingly, the main advantages of secondary sources largely address the disadvantages of primary sources. Since secondary sources aim to expand upon the material in original sources, they can provide a lot more context and meaning. This supporting information can provide much greater insight, taking advantage of the author's expertise, experience, and research - going above and beyond what you may have been able to glean from the original content.

Disadvantages of Secondary Sources

The challenge with secondary sources is that you are inherently viewing the original material through the lens of a different writer or content producer. Their experiences and biases will color how the information is presented. Two different authors can interpret the same piece of original material in two wildly different ways.

As such, secondary sources are unreliable as primary points of evidence. Instead, they're better served as sources of commentary and interpretation.


Side-by-Side Sources Comparison

A great way to understand the difference between primary and secondary sources is to look at them side-by-side, particularly when they are discussing the same story or issue.

Primary Source

Secondary Source

President Donald J. Trump's inaugural address, posted on Whitehouse.gov (2017)

President Trump's inaugural address, annotated and analyzed by the New York Times (20 January 2017)

The full text of the Declaration of Independence (1776)

The Declaration of Independence contextualized and explained by History.com (originally published 27 October 2009, updated 21 August 2018)

The Selective Attention Test video from Simons & Chabris (1999)

"'Invisible Gorilla' Test Shows How Little We Notice" on LiveScience.com (11 July 2010)

Mid-season data by Canadian Sentinel Practitioner Surveillance Network, originally reported in Eurosurveillance (24 January 2019)

"This year's vaccine 72% effective at preventing flu, scientists say" on CBC.ca (25 January 2019)

Nixon White House tapes, archived by the Richard Nixon Museum and Library

The Great Coverup: Nixon and the Scandal of Watergate, by Barry Sussman (03 December 2010)


Remember to Cite Everything

Primary sources are not necessarily better than secondary sources, and secondary sources are not necessarily better than primary sources. Both serve a different purpose, and both can be integrated into your own research and writing. You do have to ensure that you are only using credible sources for your work though.

Also, just be sure to cite your sources appropriately, both primary and secondary, by including a properly formatted bibliography as part of your report. This way, your readers will know where you got your information and can follow up with their own research if they'd like.

Primary vs. Secondary Sources
    College student performing research in the library
    Used under license / Getty Images / Frank and Helena