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We have seen a diversity of views on how to use and even whether or not to use "soft" variables in system dynamics models. Guenther Ossimitz wrote," SD works best were actual stocks and flows are involved, as in production lines, delivery chains, stocks of workforce, capital or whatev...

Perhaps the information below will be useful. =============================================== =============================================== Information on System Dynamics Jay W. Forrester August 25, 1999 System Dynamics Bibliography: To order the system dynamics bibliography of over 4100 entries, ...

Content-Type: text/plain; charset="us-ascii" In (SD2655), John Eggers wrote: >Is it conceivable to consider the creation of a >generic "model structure template" that would incorporate a "sound >problem description"...? Perhaps the template could/would >be generic enoug...

Content-Type: text/plain; charset="us-ascii" Bruce Campbell wrote in (SD2652): >If you work through the Road Maps series published by MIT there are a >number of models that deal specifically with rabbit populations ...- S >shaped growth, and >overshoot and collapse. All models appear, >on ...

I have seen students waste much time trying to define a system in causal-loop diagrams. In my own work, I have never used causal loops to start a project. Instead, I decide what system levels (integrations) are involved in the behavior of interest. Then establish the flows to and from those levels, ...

The following selections from Bruce Campbell (SD2600) raise an issue that surrounds several of the contributions to this discussion thread. >Firstly, it is implicit in Erics post that if we come up with a better >modelling method we should then be able to make better decisions. ..... >models that ca...

>But I am disturbed by the theme that one should model what people do and >how they make decisions. I thought the purpose of modeling was to discern >the key demands and resources so that the allocation process itself is >improved (including manager behaviors). >>Jack Ring, 32712 N. 70th St., Snotts...

>Don Seville and Drew Jones ask an intriguing question: >> When urban areas fill their land area, why do some tip towards decay and >> others towards gentrified "wealthy enclaves"? > Jack Homer wrote: >As a grad student many years ago, I spent some time thinking about and >modeling the iss...

Jum Hines wrote in SD2299: >Just a little point on instantaneous feedback. I think there is a (single?) >class of examples in which simultaneity exists in the real world. If you >push down on a table, doesnt the table instantaneously push up against you? > No. The table does not push back until it h...

This is the second (and last) announcement of the 1999-2000 Program. ---------------------------------------------------------------------------- The System Dynamics in Education Project at MIT is now accepting applications for the 1999-2000 Guided Study Program in System Dynamics. The Guided Study ...

The System Dynamics in Education Project at MIT is now accepting applications for the 1999-2000 Guided Study Program in System Dynamics. The Guided Study Program (GSP) is conducted by the System Dynamics in Education Project (SDEP) in the System Dynamics Group of the Sloan School at the Massachusett...

There have been many interesting and promising suggestions for the future of the System Dynamics society since the April 27 posting by Jack Pugh. On the other hand, some of the suggestions seem undesirable or beyond the means of the Society. 1. Jack suggested "promoting all forms of systems thi...

The program described below, which will begin its third year next fall, has been quite successful and is a first step in distance learning in system dynamics. >Two thoughts: first, I agree wholeheartedly that certifying programs >might be possible, while certifying individuals would be near >impossi...

The following are an addition and a correction to the useful resources from Jonathan Mozenter (SD2086) In addition to the system dynamics learning resources, the System Dynamics in Education Project at MIT conducts a Guided Study in System Dynamics by email: gsp@sysdyn.mit.edu The books below are no...

Jorge Orellana Araoz inquired: > I am interested in SD models about river basin, or references to such > models or papers/articles etc. > The following is probably out of print but may be in libraries: <fontfamily><param>Geneva</param><smaller>Hamilton, H. R., S. E. Goldstone, J. W. Milliman, A. L. ...

Perhaps you will find something of use below. Information on System Dynamics Jay W. Forrester January 28I, 1999 System Dynamics Bibliography: To order the system dynamics bibliography of over 4100 entries, specify IBM type PC, or Macintosh Send $35 in US$ drawn on a US bank to: System Dynamics Socie...

Information on System Dynamics Jay W. Forrester November 9, 1998 <bold><bigger>Note: The publisher for the books listed below has changed from Productivity Press to Pegasus Communications</bigger></bold> To order the system dynamics bibliography of over 4100 entries,=20 specify IBM type PC, or Macin...

Thank you, Tom. The source of system dynamics books has now changed. They have been shifted from Productivity Press to: Pegasus Communications, Inc. One Moody Street Waltham, MA 02453-5339 tel: 781-398-9700 fax: 781-894-7026 Tom Fiddaman wrote in (SD1890): >A classic work here is Forresters _Industr...

Perhaps the information below will be useful to you. Information on System Dynamics Jay W. Forrester November 9, 1998 Note: The publisher for the books listed below has changed from Productivity Press to Pegasus Communications To order the system dynamics bibliography of over 4100 entries, specify I...

There have been several interesting comments on the relationship of forecasts to system dynamics models. The subtlety and richness of the forecast question could justify a book. However, let me comment in two separate email messages. First is the relation of forecasting to policy design. Consider tw...

--============_-1302151624==_============ Content-Type: text/plain; charset="us-ascii" The use of forecasting for guiding decisions is restrained by considerations in the attached figure. Assume we know the past path of a variable up to the present decision time. The immediate future is de...

In the discussion of material on water resources, I do not recall anyone mentioning what is probably the first system dynamics book on the subject: Hamilton, H. R., S. E. Goldstone, J. W. Milliman, A. L. Pugh III, E. B. Roberts, and A. Zellner, 1969. System Simulation for Regional Analysis: An Appli...

The MIT Guided Study Program in System Dynamics is receiving applications from participants for its second year. The Program will begin in early September 1998 and run until June 1999. Participants must possess a computer and have access to the Internet, and be willing to devote at least fifteen hou...

>From: John Trimble <trimble@scs.howard.edu> >Given the exponential growth in the prison population in this country, >fueled by anti-drug laws and prison without parole laws, Im interested >in studying this situation/problem using system dynamics. Does anyone >know of related work in the U.S., Europ...

>> The reference is "Principles on the Relationship Between Structure and >> Behavior of Dynamic Systems", by Alan Karl Graham, approved August, 1977. > >As a relative beginner in SD this sounds really interesting. Can anyone >tell me (and interested others) how to get hold of a copy. That...