A method of ranking a plurality of regulated data sources and a plurality of non-regulated data sources for a data field is provided. The method evaluates consistency and assigns a ranking for a regulated data source based upon records having identical values and records having non-identical values for the data field in the regulated data source compared to other regulated data sources under analysis. The method further evaluates consistency and assigns a ranking for a non-regulated data source based upon records having identical values compared to other non-regulated data sources under analysis.