Ventana software support forum

Bob Eberlein wrote: > better. If the lesson is meant to be that the structure determines the > behavior and there is no room for improvement that is a dismal lesson > indeed. You should have seen the version Ive taught. :-) Seriously, I was asked to teach it to a group about 5 years ago, and I did i...

There was an article published that attempted to relate Markov processes and SD, as I recall. I seem to recall it in the 1977-1987 time frame, perhaps in the IEEE Trans. Sys. Man Cybernetics or IEEE Trans. Control Theory--it was at least in one of those types of journals. Unfortunately, I dont seem ...

Niall Palfreyman wrote: > Can anyone think of a quick, punchy demo that makes this point? I like Ive seen a colleague try this one; does this help? (Im not sure it helps with your SD case, but it might.) Take a raw egg thats sitting in a container. Ask one person to pick it up with their two index (...

I lost the beginnings of this thread--whether the focus is on free SD software or SD software on Linux. At any rate, Paul Fishwicks simpack includes some SD capability, although you might only like it if you find DYNAMO nice but too GUIfied and far from the metal for your tastes. As its a C framewor...

Kim Warren wrote: > Having worked on strategy and policy for over 20 years, I increasingly feel > that there are virtually no situations where you can safely ignore the Kim, You got the essence: accumulation and feedback. The absolute time frame matters little, IMHO, so hours vs. months is at best a...

daniel.jarosch@au.pwcglobal.com wrote: > I am currently in the process of selecting a modelling approach. does anyone > have a collection of criteria for selecting the right modelling technique? If you read German, you might take a look at _Die Praxis des ganzheitlichen Problemlösens_ by Gomez and P...

Doug, There was an article on that some number of years ago, describing work with a parish in the U.K., as I recall. I think it may have been in the European Journal of Operational Research about 15-20 years ago. Unfortunately, I seem to recall discarding my copy of the article in a cleanup a while ...

William, Youve made a good start in focusing on the problem, but Id be tempted to focus even more closely. What are you really worried about? Can you pick out one of the factors below and focus on that as the problem to gain more insight? If you had to focus that closely, is there another factor you...

I just finished a project where we were split into three or four sites across two continents, and I never left my study. There are lots of tools that can help. Ive put together a few suggestions on how to use online techniques to facilitate distributed group work in http://facilitatedsystems.com/onl...

Jim Hines wrote: > I like your comment about the desirability of building your own model. What > do you (and others) make of the many queries in this list asking for models > on this or that topic? Im bimodal. On the one hand, I agree with Geoff that building your own model has many advantages, incl...

I started to suggest that HPS has some aging chain models in some of their books which could be described as HR models and the Vensim molecules provide others, but I think Id want to hear more about the problem youre trying to solve first. Maybe you cant divulge the problem in a public forum, but I ...

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Hmm. Human mind? Have you looked at perceptual control theory? I dont know if its been applied to cognitive ability under stress, but it might be worth a glance. Bill From: Bill Harris <bill_harris@facilitatedsystems.com> -- Bill Harris 3217 102nd Place SE Facilitated Systems Everett, WA 98208 USA h...

Geoff Coyle wrote: <quoting C. P. Snow from 1940:> > "What a wonderful invention a map is. Geography would be incomprehensible You touched a synapse. Edward Tufte in his books on communicating with graphics (especially his first, I seem to recall) uses well-drawn maps as one of his examples of ...

Tom Fiddaman wrote: > At the risk of sounding like a broken record, what problem are we trying to > solve with the detailed tracking? Tom, Im fond of that question, too, so I dont mind the broken record. I didnt divulge the whole problem at first and, needless to say, that causes problems. (I did di...

Ulli, Thanks, but thats not quite what I want, I think. Im waiting to get a copy of the book, but, while I wait, I downloaded the models and looked at chapter 12. There are several aging chains, but they all have the attribute that you appear to put stuff in the front end of the aging chain and remo...

Okay, I know this should be simple, but Im having a mental block. If I want to model my behavior in buying and selling stocks, for example, Ill have personal policies that make buy and sell decisions. I can model the current price of a stock as a level that rises or falls by some mechanism (exogenou...

Great anecdotes, Jim. Here are three more notes on the "reality of Beer Games": 1: With a partner, I once led a group of manufacturing people (who should know better, right?) in the Beer Game. We used pennies as markers, and we thought we were more than generous in our estimates of the num...

Long before I discovered system dynamics, I was simulating circuits with SPICE, home-brew programs, and other such tools. (Before that, I was in school, solving differential equations on a old EAI, which I guess is close to SD.) In thinking back to those SPICE experiences, I recall a few points: Acc...

Ive posted "Applying System Dynamics to Business: An Expense Management Example" on my Web site (http://facilitatedsystems.com/pubs.html). Its a companion paper to "Pipeline Inventory: The Missing Factor in Organizational Expense Management" (National Productivity Review, Summer,...

Im curious. Alan Greenspans work would seem to be the ultimate stocks n flows game in the USA. Does anyone know if there is any explicit system dynamics thinking underlying his work? Bill From: Bill Harris <bill_harris@facilitatedsystems.com> -- Bill Harris 3217 102nd Place SE Facilitated Systems Ev...

Martin, Studying other models is important for us, for the same reason reading other novels is important for an author and hearing concerts is important for a musician. However, in solving a problem, Id encourage you to focus your early efforts on your own small, custom models. You could, based on y...

Bruce Campbell wrote: > All of the above leads to a situation where decisions, using accepted > modelling methods, are made to benefit the short term aspirations of the > powerful. Symbols and language are then created to "sell" these > decisions to the powerless (Pfeffer, Chptr 6). > > Li...

rahmanra@ind.sharif.ac.ir wrote: > Involved in the process of designing a research organization, we want to base > the process initially on SD to investigate and design growth and learning > feedbacks for the system, before planning the physical organization. > I am looking for resources discussing ...

Jennifer Espey wrote: > > I was wondering if anyone knew of an application(s) of system dynamics to cultural change. Jennifer, Here are a couple of quick possible references. Peter Stackelberg did some work on organizational and individual resistance to change about 5 years ago. The only email addre...