The purpose of this study is not to describe the principles and procedures upon which the International Trusteeship System is based—for these are set out in Chapters XII and XIII of the Charter of the United Nations. Rather will an attempt be made, on the basis of three years' personal experience (1948–1951) of the workings of the Trusteeship Council and three years' service (1956–1959) in Tanganyika, the largest of the trust territories, to assess the real impact of the system on the governments and peoples of the trust territories themselves.