This memo includes: 1) a chronology detailing the evolution of the CIA's High-Value Detainee Interrogation Techniques, how they were defined, legalized, and authorized; 2) a report on the intelligence collected after the application of the Enhanced Interrogation Techniques (EITs); 3) a report on the effectiveness of EITs; and 4) Abu Zubaydah's EIT process, specifically what EITs were approved for him and why, and the results.