The system was developed in Prolog using Swi Prolog, a free Prolog interpreter, and uses built-in predicates that may or may not be available to other interpreters. Therefore this interpreter is recommended for further work. The corresponding source code and experiment scripts are available under the Lesser GNU Public Licence (LGPL) on the world wide web at http://planeffdia.sourceforge.net/. The various parts of the program are now described.