This book explains the concept of Islamic "e;da'wah"e;, or missionary activity, as it has developed in contemporary Western contexts. Poston traces the transition from the early "e;external-institutional"e; missionary approach impracticable in modern Western society, to an "e;internal-personal"e; approach which aims at the conversion of individuals and seeks to influence society from the bottom upwards. Poston also combines the results of a questionnaire-survey with an analysis of published testimonies to identify significant traits that distinguish converts to Islam.