by Nuria Tesón, Ankita Anand, Jess Lempit, Megha Rajagopalan In Short: Start building your own contacts, learn how to develop, interact with and maintain sources and how to enrich your investigations with their cooperation. During the course of your investigation you will be in touch with people you will want to interview but also with others who will provide you information over longer periods of time and whom you may not necessarily interview. These will be your sources.