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According to Istat modernisation programme the Registers Integrated System (RIS) is the core of the data production process. The RIS enables to enlarge the level of the analysis and the quality of the information collected linking at micro-level the economic and social phenomena. In this view, the Base Register on Individuals and Households (BRIH) that identifies the usually-resident population will be enriched by the information collected by the other Base Registers (enterprises, addresses, activities) and by the thematic ones (Labour, Educational level, etc.). BRIH will be the common target for Continuous Census and Demographic and Social Statistics. To improve the accuracy of the population outputs in terms of timeliness, coverage and consistency it has been developed an information system of micro demographic accounting based on a longitudinal statistical register of individuals (Anvis). Anvis continuously monitors population changes by linking the population stock with outflows and inflows. The new system allows to adopt a multistate demographic approach for longitudinal models and for indicators based on change-of-state probabilities. Moreover, it brings together all the events related to the same person especially for the analysis of migration and migration trajectories.