A need exists to assess the changing levels and rates of urbanization, the relation of urbanization to the ongoing economic, social, and demographic changes, and the respective roles of migration and fertility in the urbanization process. This paper focuses on use of the life history component of the Economic and Social Commission for Asia and the Pacific (ESCAP) migration survey instrument for studying the relationship between migration and fertility. It relies for illustrations on research that used the life history data from the Malaysian Family Life Survey. Issues considered include the problems of research design and data, analyses using children ever born, the use of sequential data, and varying the definitions of migration. In addition to specific recommendations, there is an appendix which gives illustrative dummy tables.