From the link:
"HOW DO YOU DEFINE JIHADISM? We define jihadism as a modern revolutionary political ideology mandating the use of violence to defend or promote a particular very narrow vision of Sunni Islam. Explanation:1 While jihad is an Islamic concept which means ‘struggle’ and has both military and spiritual connotations, the term jihad-ism describes a political ideology; and while many Shia groups and individuals refer to themselves as ‘jihadists’ this count focuses on a particular movement categorised by Al Qaeda, its affiliates and those who subscribe to a similar philosophy. These jihadists believe that Islam is under attack – from the West, Israel, apostate Muslim rulers, and the Shiites – and that every Muslim must come to its defence. What differentiates jihadists from other groups and individuals that have justified violence in Islamic terms is their doctrine and long-term political vision. The jihadists’ aim is to create states or societies that are governed by an extremely narrow, puritanical interpretation of Sunni Islam known as Salafism (or Wahhabism). Salafi doctrine accounts for the jihadists’ aggressive hostility towards other sects and religions; their rejection of man-made laws and democracy; and their enforcement of public morality, dress codes, and social norms. Many groups in Pakistan and Afghanistan – most prominently the Taliban – do not classify as Salafist or Wahhabist. They typically follow the Deobandi or Ahl e Hadith traditions, which are similar to Salafism in their emphasis on literalism and have developed more or less in parallel. For the purposes of this study we have included them as jihadist groups. Some of the beliefs listed above are held by other Muslims but it is a combination of all of these beliefs along with the readiness to kill in the name of those ideas that defines jihadism in this count. Only a minority of Sunni Muslims worldwide are Salafists, and only a small fraction of Salafists are jihadists. Jihadists, therefore, do not represent mainstream Islam, and their doctrine, views and methods are not shared by the vast majority of Muslims."
"HOW ARE YOU DEFINING GROUPS OF JIHADISTS? This research is based on the assumption that, in addition to acts of violence carried out by (nameless) networks and individuals, the majority of jihadist incidents are the responsibility of groups. The methods we used for identifying groups in this study were based on: 1) The definition of jihadism as laid out in the methodology of this project. 2) The feedback from three independent reviewers (Prof Mark Sedgwick; Prof Martha Crenshaw; Dr Omar Ashour). 3) An academic ‘Jihadist Scoring System’ devised by John David Payne, Donna Lee Bowen, and Joseph Woolstenhume2 , to determine whether “jihadism” is the predominant motivation for all the groups and actors included in this exercise. This study has not set out to study all Islamist violence. We are aiming to produce data focused on a particular type of violent conflict – namely Al Qadea groups, their affiliates and other groups motivated by a very similar ideology."