The current chapter focuses on the theoretical aspects of research on radicalization and lone wolf terrorism. The aim is to extract the justification of our research goals and tools and explore what ground we made our assumption of truth about the social phenomenon investigated. Several doctrines of thought are here revisited to frame our observations on radicalization and terrorism. The philosophical, ontological, and epistemological bases of psychological research in radicalization and terrorism are formulated in the current chapter.
Keywords: Epistemology, Lone Wolf, Ontology, Philosophy, Research, Terrorism.