Throughout the first nine chapters I have introduced explanatory concepts from the social sciences piecemeal. They have made their appearance in the argument as seemed appropriate and helpful in understanding fundamentalism at different levels of analysis, from the global, through the local, to the personal level. There has been little structured theoretical account, and this chapter is a very preliminary attempt to provide one. In the belief that there is nothing so practical as a good theory, I will conclude by pointing up some implications for relationships with fundamentalists.