AI Tutor
If a government poster from 1933 claims that agricultural harvests broke all records while millions were starving, does that lie make the poster useless to a historian?
In historical enquiry, a completely dishonest document can actually be a goldmine of evidence.

Reliability Versus Utility

Reliability measures whether a source gives an accurate, truthful factual account of events.
Utility measures how useful a source is for answering a specific historical question, regardless of its factual truth.
A source can never have "general utility" in a vacuum—its value depends entirely on the specific question you ask of it.
How do historians extract truth from documents designed to deceive or exaggerate?

Unintentional Testimony

In 1898, French historians Charles-Victor Langlois and Charles Seignobos introduced modern source criticism, demonstrating that every document contains two distinct layers of evidence.
Intentional testimony is what the author consciously wants you to believe, while unintentional testimony reveals the author's hidden assumptions, anxieties, and cultural values.
Even deliberate fabrications or censorship tell you what an authority feared most and felt compelled to hide.