Abstract: A change list tracking mechanism supports features that require a record of values that have been modified in a document of a project management software application. Examples of the features supported include multiple undo, report generation, and audit logging. The change list tracking mechanism includes object containers and change lists. Each object container includes objects that are associated with properties of the document. A user who wants to be notified of specific modifications creates the change list to track modifications made to a specific object property in a particular object container. A property value identified in the change list may be modified by any user that accesses the document. The corresponding object container provides information about the modification to the change list. The user is identified and notified of the modification.