• Primary?
  • Direct from the origin
    • Scientist who conducted the research
    • Politician who made the statement
    • Judge who tried the case
    • Victim of the crime
  • Someone who not only was there but was directly involved
    • Not just a witness
    • A participant
• Secondary?
  • Someone who talked to the primary source
  • Someone who read the primary source
  • Someone who was indirectly involved

And for both primary and secondary sources: