The book is the outcome of a research project sponsored by the ICSSR, New Delhi. The study was carried out among the Tangsas of Arunachal Pradesh. Their main concentration is in the districts of Tirap, Changlang and Lohit. The present work was confined among the Tangsas of Changlang district. The book covers a wide spectrum of topics ranging from economic condition, family and marriage system, religious beliefs and practices, living conditions, healthcare situation, which vividly reflect the ethnographic present. Considering this background, efforts has also been made to project the demographic situation, particularly composition and fertility. Though there are many areas to cover on the Tangsas, yet the researchers felt that it would, no doubt, help the future scholars to work among these tribes.