council direct synchron gener popul census eec council european commun regard treati establish european econom commun articl thereof regard draft direct submit commiss commiss possess suffici reliabl detail compar data popul employ household order fulfil task assign treati articl thereof present gener popul census necessarili provid data compar commun level classif tabul design meet nation period exhaust survei popul princip social econom famili characterist individu indispens studi definit region social polici affect sector commun order judici made data draw comparison member state date data refer close intern organ unit nation organ council europ recommend census organ begin decad gener popul censu requir lengthi prepar adopt direct articl member state french republ italian republ conduct gener popul censu date march french republ conduct gener popul censu date februari italian republ conduct gener popul censu date march octob articl commiss collabor compet author member state draw programm statist tabl prepar basi census refer articl cover demograph econom social characterist individu household famili nation region level complet tabl forward commiss articl member state unabl carri exhaust censu accord articl suppli statist data compar articl respect basi altern method regist sampl survei articl direct address member state brussel council presid hansenn