1. A method for aiding debugging of program code in a computer system, the computer system comprising an input system and an output system, the program code comprising a plurality of program code statements, the method comprising: utilizing the input system to indicate an error variable in the program code, the error variable containing an error value that differs from a first desired value; obtaining an error set of the error variable, the error set comprising a subset of the program code statements, each program code statement in the error set being relationally connected to the error variable; assigning a priority value to each program code statement in the error set, each priority value indicating a computed probability that the associated program code statement is an error source of the error variable; and utilizing the output system to present each program code statement in the error set in a manner that indicates the relative ordering of the priority value of the program code statement to the other priority values of the other program code statements in the error set.