A key factor in the spatial structure of metropolitan areas is the relationship between workplace and residential location. This is particularly critical in any attempt to model the changes in structure which result from intra-metropolitan moves of employment and households. This paper attempts to provide a more satisfactory framework for understanding the dynamics of these changes. Empirical evidence is presented for the London region based on both aggregate data from unpublished Census material and the Greater London Transportation Study and disaggregate survey material from a specially commissioned household interview survey.