A short ICSR article 'Al-Shabaab: Recruitment and Radicalisation in Kenya':http://icsr.info/2012/11/icsr-insigh...tion-in-kenya/

Based on our fieldwork with former al-Shabaab members in Kenya, about half of the people we interviewed were motivated by financial rewards. The other half were taken in by the teachings of Ali and other jihadist preachers.