Intelligence is the subject of a great deal of popular interest, but it is also the subject of a great deal of popular misunderstanding. Just what is intelligence? What is it for? How is created? Is it all about spys and covert operations?

This note book is meant as a quick introduction to the vast subject of intelligence studies.

• What is intelligence?
  
• Sources
  • HUMINT
  • IMINT
  • SIGINT
• Types of Intelligence
• The intelligence cycle
  • Other versions of the intelligence cycle
• Further reading