• Primary sources are information provided by people who were involved in historical events or who witnessed the events. (Written/Pictorial/Oral Evidence , Artefact)
• Secondary sources are the records of people who did not directly participate in or witness the events they describe.

Historians make sure that their evidence is reliable by using the three Cs test. (Credibility, Consistency & Corroboration)

• Credibility : Historians ask if the person who provided he evidence is trustworthy.
• Consistency : Historians ask whether the evidence is consistent if it contains statements that have similar meanings.
• Corroboration : Provide information to support evidence.

3. Why and when is it necessary for historians to revise their interpretations of past events?

• They have to be updated and revise their intepretations of the past when new evidence becomes available.