Thanks, this is excellent stuff, much appreciated. I've cc'd it to the list because I'm guessing there are people who must be interested in in this too. the link wouldn't work for me but the csail Digital Repository saved me; <a href="http://publications.csail.mit.edu/">http://publications.csail.mit.edu/</a> --- AIM-2002-005 Author[s]: Gregory T. Sullivan Advanced Programming Language Features for Executable Design Patterns "Better Patterns Through Reflection March 22, 2002 <a href="ftp://publications.ai.mit.edu/ai-publications/2002/AIM-2002-005.ps">ftp://publications.ai.mit.edu/ai-publications/2002/AIM-2002-005.ps</a> <a href="ftp://publications.ai.mit.edu/ai-publications/2002/AIM-2002-005.pdf">ftp://publications.ai.mit.edu/ai-publications/2002/AIM-2002-005.pdf</a> The Design Patterns book [GOF95] presents 24 time-tested patterns that consistently appear in well-designed software systems. Each pattern is presented with a description of the design problem the pattern addresses, as well as sample implementation code and design considerations. This paper explores how the patterns from the "Gang of Four'', or "GOF'' book, as it is often called, appear when similar problems are addressed using a dynamic, higher-order, object-oriented programming language. Some of the patterns disappear -- that is, they are supported directly by language features, some patterns are simpler or have a different focus, and some are essentially unchanged. <div class="gmail_quote">On Dec 14, 2007 2:43 AM, Prabhakar Ragde <<a href="mailto:plragde@uwaterloo.ca">plragde@uwaterloo.ca</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> This may or may not help. <a href="http://www.ai.mit.edu/%7Egregs/aim-2002-005.pdf" target="_blank">http://www.ai.mit.edu/~gregs/aim-2002-005.pdf</a> --PR </blockquote></div> -- Cheers, Stephen -- Stephen De Gabrielle <a href="mailto:s.degabrielle@ucl.ac.uk">s.degabrielle@ucl.ac.uk</a> Telephone +44 (0)20 7679 5242 (x45242) Mobile                  079 851 890 45 <a href="http://www.uclic.ucl.ac.uk/annb/MaSI.html">http://www.uclic.ucl.ac.uk/annb/MaSI.html</a> University College London Interaction Centre Remax House - 31/32 Alfred Place London - WC1E 7DP