Data from a plurality of data sources is provided to a multi-source data management system, which stores the data and provides it to a data accuracy system for purposes of assessing the accuracy of data records and the individual fields within data records. Data accuracy scores may be stored at the data management system with the data records to which they pertain. Accuracy scores may be periodically recalculated and monitored, and alerts provided if an accuracy score changes a predetermined amount over a given period of time. Also, data records may be provided by a data user for accuracy assessment, using other data records stored at the multi-sourced data management system.