A computer program debugger is disclosed which stores previous programs which have been debugged and the debug parameters which were considered when debugging. When a new computer program is to be debugged, the new debugger is invoked and it automatically compares the executing program to be debugged with the previous programs. When one or more of the debug parameters are so similar that it can be said that the computer program undergoing debugging matches a previously stored computer program, a user is given options to display the matching programs, the modules, the functions, the lines, and the debug parameters and to exchange debug parameters between the programs which can be used to mod4 the either or any of the programs. The user is further given the option to store the current program undergoing debugging as a new program to be considered in matching the next program to be debugged.