Perceptible Software for Maintenance and Enhancement

When we execute a program, we cannot know its behaviour inside the program. Even by using a debugger, we cannot know the correspondence between a part of its output and a part of the program, either. The program being executed is a kind of black box to the people who are using it. This paper presents the concept of perceptible software that changes a program being executed from a black box to a white box, and describes an example of its implementation PercSoft.Keywords Enhancement, Maintenance, Perceptible, Virtual GUI, Visualization