After the Institute for Economics and Peace labeled the Islamic State of Iraq and Syria (ISIS) the "deadliest and wealthiest terrorist group," Al-Arabiya English turned to Dr Christina Schori Liang, GCSP Senior Programme Advisor and Senior Fellow in the Emerging Security Challenges Programme, for help deconstructing the 2016 Global Terrorism Index Report.
Dr Schori Liang, an expert contributor to the Report, explained to Al-Arabiya English both the size of ISIS forces and the scale of their territory:
"At the end of 2015, ISIS controlled 6-8 million people in an area the size of Belgium, and maintained a force between 30,000-50,000 fighters while attracting the greatest number of foreign fighters in history."
Produced by the Institute for Economics and Peace, the Global Terrorism Index scores 163 countries over the past 16 years (from 2001 to 2016) using data from 1998 to 2015. It scores countries by aggregating the number of terrorist incidents, number of fatalities, injuries and the amount of property damage and then weighting the results over five years with the highest weighting being the most recent year.