Q. How do I know if something is Common Knowledge?

What is considered Common Knowledge?


The concept of common knowledge was introduced in 1969 by the US philosopher David Kellogg Lewis (1941–2001) in his book Convention: A Philosophical Study and can be defined as information that every member of a specified group knows to be true (Colman, 1). This is usually information that is well-known and regarded as an irrefutable and unchangeable fact. 

Although some historical, scientific, and geographical facts can be paraphrased as common knowledge, we recommend checking with your professor to determine it can be done appropriately in your assignment.


Andrew Colman. 2015. Common Knowledge. https://www-oxfordreference-com.libdatab.strayer.edu/view/10.1093/acref/9780199657681.001.0001/acref-9780199657681-e-1674.

  • Last Updated Jan 27, 2021
  • Views 2
  • Answered By Inga Ivory

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