Lawyers and anthropologists who are equally concerned with scientific and pragmatic questions have called for investigation of specific instances of legal change. Such men as Garland and Roth (1967), Healey (1964), Schiller (1965), Thompson (1968), and Twining (1964) have pointed out the need for concrete facts and figures for use in evaluating particular theories of and hypotheses about the process of legal change. In The Place of Customary Law in the National Legal Systems of East Africa, Professor Twining comments that “it would be of great value to have some intensive studies in depth of the introduction of the new courts system and the unified customary law” in Tanzania (1964: 51). He adds that “it is encouraging to hear that a private research project on similar lines is under way in Sukumaland” (1964: 59, fn. 42).