A group of people who are devoted to this noble calling and who aim to foil all external threats to their organization have to maintain strict organizational norms and values, which Professor A K M Nazir Ahmad highlights in this book. Since the aims and objectives and the nature of Islamic da‘wah organizations all over the world are largely the same, his ideas will be useful to those who take calling people to Allah’s way seriously, no matter where they are geographically located. And this is what inspired me to translate this important Bangla work into English for the benefit of the global readership.