The Inevitable Stability of Software Change

Real software systems change and become more com-plex over time. But which parts change and which parts re-main stable? Common wisdom, for example, states that in a well-designed object-oriented system, the more popular a class is, the less likely it is to change from one version to the next, since changes to this class are likely to impact its clients. We have studied consecutive releases of several public domain, object-oriented software systems and ana-lyzed a number of measures indicative of size, popularity, and complexity of classes and interfaces. As it turns out, the distributions of these measures are remarkably stable as an application evolves. The distribution of class size and com-plexity retains its shape over time. Relatively little code is modified over time. Classes that tend to be modified, how-ever, are also the more popular ones, that is, those with greater Fan-In. In general, the more “complex ” a class or interface becomes, the more likely it is to change from one version to the next. 1