In this paper, we exploit our taxonomy that allows the 
maintainer to catalog classes based on the characteristics 
of the class. The characteristics of a class include the 
properties of data items and methods as well as the 
relationships with other classes.  We construct a tool 
that uses the taxonomy to catalog each class in an 
application.  We use the tool to track changes across 
multiple releases of applications containing hundreds of 
classes, providing detailed information about each
changed class.