The study of population change and its consequences is the scope of the demography stream. Research in the department joins the macro approach of traditional demography with the multilevel, actor-oriented life course approach. The macro approach of traditional demography is epitomised by the decomposition of population dynamics into fertility, mortality and migration trends and by the measurement of such dynamics and trends. The multilevel, actor-oriented life course approach sees individual trajectories and key life course events (including births, deaths and migrations) as embedded in a multilevel factorial model which emphasises the role of the historical and geographical context; the role of kinship and network ties; and the role of human development, therefore generalising the traditional demographic emphasis on period, cohort and age.