Transcript of testimony by Brian Jenkins to the House Homeland Security Committee, Subcommittee on Intelligence, Information Sharing and Terrorism Risk Assessment on 5 Apr 07:

Building an Army of Believers: Jihadist Radicalization and Recruitment
...Recently, we have begun to focus more attention on what I refer to in my book as the “front end” of the jihadist cycle. Growing concern has produced a growing volume of literature on the topic. My testimony today will simply highlight a few areas for further discussion:

- Building an army of believers—how the jihadists recruit
- Radicalization and recruitment in the United States
- How we might impede radicalization and recruitment, and
- Guiding principles for any actions we might consider.

These comments derive from my own study of terrorism over the years, and from a large body of research done by my colleagues at the RAND Corporation....
In reference to the last line quoted above, here are links to the footnoted documents:

Al-Qaida: Terrorist Selection and Recruitment

Al Qaeda Recruitment in the United States: A Preliminary Assessment (The link is actually to the MIPT 2004 Terrorism Annual; the article is on page 29 of the pdf)

The Dynamic Terrorist Threat: An Assessment of Group Motivations and Capabilities in a Changing World