Inter-module Coupling
Aggregate to the module or class level to quantify module interactions.
Group rows and columns into submatrices that are indexed by modules or classes.
Each off-diagonal submatrix measures dependency between one pair of modules; the on-diagonal submatrices measure internal module dependencies.
Large systems can be compressed, and 2D or 3D Visualizations can be derived.*
* For example, see Bray and Hess: Reengineering a Configuration Management System, and Wong et al: Structural Redocumentation: A Case Study, in IEEE Software Jan 1995