Abstract: A system for governing entry of data into a database commonly accessible by a plurality of entities, each of which has requirements for its data that differ from the requirements of other entities, comprised one or more rules base servers for storing a rules base data structure. The data structure is a collection of documents which are either a rule applicable to an entity or a rules interface which provides a navigation route to an applicable rule. The system includes a rules engine which executes an algorithm that recursively searches the documents in the rules base, evaluating each document until a rule is found, executing the rule, and storing the result returned by the executed rule, until all applicable rules for the entity submitting the set of data are executed.