摘要: This paper treats quality control in a wide sense which is imperative for statistical agencyto do. First, we discuss the meaning of total survey error and different characteris- tics. Secondly, some common problems agencies are presented as prelude to bulk this paper, namely case Sweden. Quality efforts at Statistics Sweden reviewed regarding handling specific sources, estimation, control. Different tools such preventive control, production evaluation dealt with. As QC-procedures proper provide applications from clerical coding.