The project "ESSnet Statistical Methodology -- Area ISAD" (Integration of Survey and Administrative Data), consisting of the NSIs of Austria, the Czech Republic, Italy, the Netherlands and Spain, aims at promoting knowledge and application in practice of sound methodologies for the joint use of existing data sources in the production of official statistics. The NSIs in the ESS face growing duties of data supply and dissemination, while budgetary constraints and increasing public concern about data privacy and response burden on the respondent units - either individuals, households or enterprises - arise. The integration of different data sources, especially data previously produced for administrative purposes, seems to be a cheap and reliable alternative.

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