Users of statistical business registers want those registers to be ‘of good quality’. It is therefore important to establish what level of quality is required, to have a policy to monitor and, where necessary, to improve the quality of the register. This approach is consistent with the definition of quality in the ISO standard 9000:2000, which states that quality is the ”degree to which a set of inherent characteristics fulfils requirements”. Therefore the quality of statistical business registers can be determined by the extent to which they meet user needs. The main aspects of quality are:???Relevance ???Accuracy ???Timeliness and punctuality ???Accessibility and clarity ???Comparability ???Coherence