Mikrocensus 1990, 1. quarter: Extended Housing Survey, Knowledge of Foreign Languages

The special survey in March 1990 is on the topic of extended housing survey ("Erweiterte Wohnungserhebung"), just as in the previous years (Mikrozensus MZMZ7601, Mikrozensus MZ7501, …). In addition, there are questions on sideline jobs, one question block on possible knowledge of foreign languages of the various members households.1990年3月开展的专项调查主题为扩展住房调查（"Erweiterte Wohnungserhebung"），与此前数年的微人口普查MZMZ7601、MZ7501等保持一致。此外，该调查还包含副业相关问题，以及一个用于了解各家庭成员外语掌握情况的问题模块。