The present invention provides a data processing system and a method of assessing the data value of a data assets inventory which comprises:a) preparing a data map on a computer database comprising inputting data types and data subtypes into said database, connecting a data storing location to the data subtypes and recording the data subtype occurrences in said database;b) assigning a weighting to each data subtype occurrence in said database to provide a data assets inventory and recording the data assets inventory in said database;c) preparing evaluation types on said database wherein the evaluation type has a calculation type attribute and wherein the evaluation type is either quantity independent or quantity dependent;d) connecting at least one evaluation type to each data subtype with a reference value and recording the reference value in said database;e) determining the data value of the data assets inventory and recording the data value in said database wherein when the evaluation type is quantity dependent then the value is the product of the weighting, the reference value and the quantity at the data storing location for each data subtype occurrence or wherein when the evaluation type is quantity independent then the value is the product of the weighting and the reference value for each data subtype occurrence.展开▼