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Internal migration is discussed in terms of both its spatial & temporal characteristics. 2 types of methods for measuring internal migration are delineated: (a) the `residual method,' which makes use of data for measuring pop growth & its coinponents, (b) methods which depend on data providing direct information about the migratory status of each person. The use of the residual method is limited in Latin America because of the incompleteness of vital statistics. Under some circumstances, however, corrective factors can be introduced. The applicability in Latin America of methods which depend upon census recording of place of birth, sex, & age, is discussed, & examples are given. Procedures to obtain information on the distribution of migrants in time, & the use of cohorts & promotions to determine the variation of this distribution by age, are compared with those used in similar studies in the US. P. Metzger.