Ventana software support forum

There is a position opening at the Woodrow Wilson School at Princeton which would be appropriate for system dynamics practitioners. If you are interested you may write to Dean Michael Rothschild/STEP Search, Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, ...

On Sat, 1 May 1999, Stephen Wehrenberg wrote: > Second, and perhaps more easily done, Id like to see some way for us to > communicate what we are working on/with ... particularly practitioners > and dilettantes (such as ... oh, say ... me!). Perhaps a section in the > Journal that might have entries...

The article you are seeking, I think, is Danas "Whole Earth Models and Systems," which appeared in the Coevolution Quarterly in 1982. It is now reprinted in the collection I edited called Modelling for Management, but tends to be hard to find otherwise. ...GPR -----------------------------...

Bruce Campbell asked if there is any literature on modeling problems vs. modeling systems. Id say the first place a discussion of these issues appears is in Jorgen Randerss thesis done at MIT around 1974. I dont have here at home the exact cite, but you could find it in Randerss Elements of the Syst...

There is a very cute little spiral-bound book (3"x5"x1/2") called "The Memory Jogger II" that contains an amazing number of graphic tools ranging from affinity diagrams, preto charts, improvement storyboards, to radar charts, tree diagrams, and prioritization matrices and th...

In response to a number of requests for copies of Feedback Thought in Social Science and Systems Theory, which is out of print, I have recently found out the following: 1) The book may be ordered from University Microfilms International (1-800-521-0600). Order number = 2069873. Price = $119.40 [terr...

I think the one who first used causal-loop diagrams would probably have been Ed Roberts at MIT (and Pugh-Roberts) in the early 1960s. Jays "Market Growth" paper (1968) has a form of causal-loop diagram. One of the earliest causal-loop diagram consulting interventions I know of (that was pu...

One version of some of these would be found in the definition of system dynamics in the Encyclopedia of Operations Research and Management Science, which I wrote in an effort to be inclusive but it no doubt represents one view of the characterization of the field. Another attempt at a statement of t...

> Does any of you know if there is a model (Stella, Vensim or other) of this > physiological feed-back ? Indeed I do. In the 1970s a student of mine, Bill Silverman, did his bachelors thesis on this topic, building an endogenous theory of the menstrual cycle. Excellent work. I have a copy if you wan...

There is a world (view) of difference between modeling in spreadsheets and system dynammics modeling. The essence of the difference is that spreadsheets capture DISCRETE year-to-year (or time unit-to-time unit) changes while system dynamics simulations attempt to capture a CONTINUOUS view of change....

On Wed, 4 Nov 1998, eduardo giordanelli wrote: > My question could be stated in the following terms: > We use System Dynamics because is an easy, but not accurate, tool to use > ? Or it could be an accurate tool when dealing with not learning systems > and becomes not accurate only when confronted w...

Bill asks if we cant model systems, apparently thinking that we can. Id ask Bill, if someone asked you to model a city (e.g., Cleveland), would you know what to do? Id say I wouldnt, and I think you wouldnt either. So I conclude I cant model a system, without some definition of the dynamic problem f...

A correspondent asked about "mental models" in psychology: In the Proceedings of the System Dynamics Conference at Stirling, Scotland (1994) we have a paper that talks about mental models and has a pretty good bibliography: G.P. Richardson, D.F. Andersen, T.A. Maxwell, & T.R Stewart. 1...

There was a good dissertation done at MIT in the 1970s by Bill Shaffer on the dynamics of the criminal justice system in Massachusetts. I believe some similar work was done in Vermont but I dont know the details. A data-based dissertation using a system dynamics framework to analyze the causes of pr...

I recall hearing one of the authors of "Mankind at the Turning Point" by Mesarovic and Pestel (a book published by the Club of Rome after "Limits to Growth") claim the same theorem mentioned in this query. Mr. Winston may find a reference in that book to the theorem and its sourc...

The author of this tiny list should consult the system dynamics bibliography and collections of applications like Roberts "Managerial Applications of System Dynamics" and my more recent collections "Modelling for Management." And what is the list for? ...GPR ---------------------...

Work on the dynamics of solid waste was done here at the Rockefeller College by Ali Mashayekhi and Ik Jae Chung. An article on Alis work apapeared in the System Dynamics Review a few years ago. Ik Jaes dissertation is an extention of that work looking at the dynamics of the development of markets fo...

I believe the Pugh-Roberts study was about the "introduction of minorities into management," and was done, as Joel says, many years ago. ...GPR ----------------------------------------------------------------------- George P. Richardson G.P.Richardson@Albany.edu Rockefeller College of Publ...

On Wed, 21 May 1997, Bill Godfrey wrote: [...] > Secondly, where can I find some basic material on the particular issue of > modelling stocks and flows of information, in particular how to handle > the peculiar characteristics that > - an inflow increases stock > - an outflow (use) does not decrease...

The best texts for learning the basics are probably the manuals that come with the STELLA/iThink software or the old Richardson and Pugh text Introduction to System Dynamics Modeling with DYNAMO, reprinted by Productivity Press. There are newer texts by Wolstenholme, Ruth, and Coyle (Wiley, Sage, an...

On Mon, 20 Jan 1997, THOMAS BARRY wrote: > I am a graduate sudent here at Trent University and my area of interest is > in applying Systems Dynamics in the creation of a Macroeconomic model of a > small developing country. Does anyone has information on other work in this > area? Regards, It would i...

We seem to be getting ourselves in knots over the question of whether to use stocks and flows ("tubs and pipes with valves") in our systems diagrams or whether to limit ourselves to words and arrows without explicit recognition of stocks and flows. Cant we treat this as we treat a number o...

This question is well answered by the System Dynamics Bibliography available on disk or on line (http://www.std.com/vensim/SDBIB.HTM) for a small fee. ...GPR ----------------------------------------------------------------------- George P. Richardson G.P.Richardson@Albany.edu Professor of public adm...

On could argue that "fuzzy logic" is used in almost every model system dynamicists build. Repeatedly, thinking about aggregates "smoothes out" influences that for an individual would be shaped like a step, exactly the way the membership function in a fuzzy set is a smothed out ve...

---------- Forwarded message ---------- Date: Thu, 06 Feb 1997 15:23:04 +0100 From: fabian szulanski <fabians@ifi.uib.no> To: gr383@cnsvax.albany.edu Subject: Re: REPLY ST & SD in half an hour (SD0701) Dear Prof. Richardson, Thank you for your insights. Ive read the paper you mentioned about gro...