Mr. Burch,
I am responding to the letter you sent the Club of Rome.
Our initial version of World3 was published and excruciatingly documented in a 600+ page book, "The Dynamics of Growth in a Finite World." That book is still sold by Pegasus communications. The discussion of the theory and the data underlying the equations is still intereesting, but the equations themselves were written in DYNAMO a computer language that has become obsolete.
http://www.pegasuscom.com/BookSearchResultList.asp?BookQuery_Action=Filter(%22++Keywords+LIKE+%27*System+Dynamics*%27%22)
In 1992 we made minor revisions in the model for our book, "Beyond the Limits." The appendix to the book tells precisely what was changed. Mainly it was in the formulation of the policies embedded in the technology change sector. In 1992 we used an early version of STELLA for composing the model.
For the 2004 book, "Limits to Growth - the 30-Year Update," we made again a couple of minor changes. Now you can get the model in a STELLA runtime version on a CD with an interface that lets you reproduce all the scenarios published in our book and examine 74 parameters every 5 years from 1900 to 2100 for each scenario.
If you write to the Sustainability Institute you can buy this from them.
http://www.sustainer.org/tools_resources/games.htmlCordially,
Dennis Meadows