(3)The overall quality of data in the CSDB can only be assessed at the level of output data rather than at the level of individual sets of input data. To ensure the completeness, accuracy and consistency of output data, to the extent possible, it is necessary to define a framework for data quality management (DQM) to be applied to output feed data, a subset of output data that can be used to support the production of statistics or other uses. Output feed data is provided to NCBs no later than seven working days following the end of each calendar month.