Abstract: 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 quant