1. A computer-implemented method for sorting and displaying a sequence of permutations of a table of data objects, said method comprising concurrently displaying, by a computer system, a data table containing a number of data objects, each with associated values of specified parameters, and an item screen, said item screen including parameter value information concerning a selected one of the data objects from the data table and user-manipulable controls for entering information concerning said selected one of the data objects, and references to related others of the data objects in the data table.