Common Lisp library and executable for Delta Debugging (see [1] for information on Delta Debugging) Implementation of the delta debugging algorithm from [2] in the Common Lisp DELTA-DEBUG package. The DELTA-DEBUG-EXE package compiles a command line executable which minimizes either plain text files by line or patch files by diff. Footnotes: [1] http://www.st.cs.uni-saarland.de/dd/ [2] Zeller, Andreas, and Ralf Hildebrandt. "Simplifying and isolating failure-inducing input." Software Engineering, IEEE Transactions on 28.2 (2002): 183-200.