Since its inception, ESOC has supported work to understand terrorist groups’ characteristics, motivations, and organizational structures. This line of research began before ESOC, when Joe Felter organized the Combating Terrorism Center’s (CTC) Project Harmony, an effort to declassify and analyze internal al-Qa’ida documents. ESOC scholars carried the work forward, developing game theoretic models to understand terrorist management practices and working with RAND and the CTC to declassify a wider range of terrorist organization documents from Iraq.