1. A data processing system, comprising: means for storing database tables holding customizing parameters for customizing an application program; means for execution of the application program; means for execution of a trace program; means for execution of an analytical program; means for storing a set of results provided by the application program; means for storing trace data acquired by the trace program during execution of the application program, the trace data comprising a path for each of the results, each path being descriptive of a sequence of database table entries of the database tables holding a sub-set of the customizing parameters used for calculation of the corresponding result; and means for displaying the results on a user interface, wherein the analytical program is operable to receive a user's selection of one of the results being displayed on the user interface and display sequentially the database table entries identified by the path of the selected one of the results.