Search found 29 matches
- Sat Jul 01, 2006 1:33 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE SD in the News
- Replies: 0
- Views: 2834
ANNOUNCE SD in the News
Posted by Bill Braun <bbraun@hlthsys.com> The Canadian Government is investing in transportation planning. One of the grants is to McGill University for ""Modeling the Impact of Growing Overseas Trade on Canadian Seaports: A System Dynamics Approach"". Full article here: http://w...
- Sat May 20, 2006 12:44 pm
- Forum: SD Mailing List Archive
- Topic: QUERY Pedagogical Causal Loop Diagrams
- Replies: 2
- Views: 3908
QUERY Pedagogical Causal Loop Diagrams
Posted by Bill Braun <bbraun@hlthsys.com> Will, I suggest you use wiki technology. This will make uploads easy and keep your webmastering to near nothing. Visit http://www.mediawiki.org/wiki/MediaWiki Regards, Bill Braun Posted by Bill Braun <bbraun@hlthsys.com> posting date Fri, 19 May 2006 07:41:1...
- Sat Apr 08, 2006 1:39 pm
- Forum: SD Mailing List Archive
- Topic: SD and other modelling approaches
- Replies: 11
- Views: 10652
SD and other modelling approaches
Posted by Bill Braun <bbraun@hlthsys.com> John, is it that dichotomous, academics versus practitioners? I straddle both sides of the fence, and I find that one view of the world does a nice job of informing the other - I'm more practical in the classroom and more circumspect in the field. If THE BES...
- Thu Mar 30, 2006 2:08 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE SD In the News
- Replies: 0
- Views: 2908
ANNOUNCE SD In the News
Posted by Bill Braun <bbraun@hlthsys.com> >From The Jamaica Observer PIOJ takes steps towards long-term economic model Camilo Thame Wednesday, March 29, 2006 The Planning Institute of Jamaica is incorporating SD into its economic planning efforts. http://www.jamaicaobserver.com/magazines/Business/ht...
- Tue Mar 14, 2006 1:00 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE SD Principles In the News - Science
- Replies: 0
- Views: 2790
ANNOUNCE SD Principles In the News - Science
Posted by Bill Braun <bbraun@hlthsys.com> Past conversations have sought examples of the principles of SD in various disciplines. Two examples appear in The Scientist - Papers to Watch: B.P. Tu et al., “Logic of the yeast metabolic cycle: temporal compartmentalization of cellular processes,” Science...
- Wed Mar 08, 2006 12:57 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE SD in the News
- Replies: 1
- Views: 7212
ANNOUNCE SD in the News
Posted by Bill Braun <bbraun@hlthsys.com> http://www.army.mil/professionalwriting/volumes/volume4/march_2006/3_06_3.html This is a very interesting article about the thinking that is going on in the US Army, and their approach to designing organizational structures. They do not use the term "&q...
- Tue Feb 28, 2006 1:16 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE Systems Thinking in the News
- Replies: 0
- Views: 2961
ANNOUNCE Systems Thinking in the News
Posted by Bill Braun <bbraun@hlthsys.com> http://politics.guardian.co.uk/economics/story/0,,1718118,00.html An article on systems thinking (""joined-up thinking"" in their terms) in politics and government, focusing on the NHS (National Health Service). >From The Guardian (UK). B...
- Sun Feb 12, 2006 1:31 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE SD in the News: Energy Modeling
- Replies: 0
- Views: 2738
ANNOUNCE SD in the News: Energy Modeling
Posted by Bill Braun <bbraun@hlthsys.com> http://www.vermontguardian.com/local/022006/StateEnergy.shtml An article in the Vermont Guardian that describes a long-term planning effort to establish energy policy, and which involves the use of SD. The article makes reference to mediated modeling, based,...
- Thu Jan 05, 2006 3:49 am
- Forum: SD Mailing List Archive
- Topic: Bond Graphs
- Replies: 0
- Views: 2815
Bond Graphs
Posted by Bill Braun <bbraun@hlthsys.com> I've been coming across a number of references to bond graphs and system dynamics (ref., Karnopp, Margolis, Rosenberg, Mukherjee, and Karmakar to name a few). There is a web site dedicated to it (bondgraphs.com). How are the two related? Bill Braun Posted by...
- Fri Dec 30, 2005 3:22 am
- Forum: SD Mailing List Archive
- Topic: The "usefulness" of SD
- Replies: 18
- Views: 31164
The ""usefulness"" of SD
Posted by Bill Braun <bbraun@hlthsys.com> >>I find the ongoing (and sometime repeated) >>discussions of ""SD is this, but not that..."", ""SD is better than xyz, >>because ..."" somewhat tedious. To revisit a topic of conversation is not the same as having the...
- Fri Dec 16, 2005 12:21 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE SD in Investing
- Replies: 0
- Views: 4825
ANNOUNCE SD in Investing
Posted by ""Bill Braun"" <bbraun@hlthsys.com> Interesting article on an investment firm that is using SD. http://business.bostonherald.com/womensBusiness/view.bg?articleid=113418 Bill Braun Posted by ""Bill Braun"" <bbraun@hlthsys.com> posting date Thu, 15 Dec...
- Sat Dec 03, 2005 12:57 pm
- Forum: SD Mailing List Archive
- Topic: Characterizing System Dynamics
- Replies: 33
- Views: 31383
Characterizing System Dynamics
Posted by ""Bill Braun"" <bbraun@hlthsys.com> I'll ask again if my understanding of the word emergence is faulty. I think it is the behavior that results from the interaction of policies. In any organization, no one policy - or even a subset of policies, randomly or intentionally...
- Mon Nov 21, 2005 11:57 am
- Forum: SD Mailing List Archive
- Topic: Characterizing System Dynamics
- Replies: 33
- Views: 31383
Characterizing System Dynamics
Posted by Bill Braun <bbraun@hlthsys.com> At 07:11 AM 11/19/2005 -0500, wakeland pdx.edu wrote: Posted by wakeland@pdx.edu >I do not agree with posting SD5621 about adding emergence (as in >""boids"") > >to the list of SD characteristics. > >I believe that the behavior in SD is a...
- Fri Nov 18, 2005 12:08 pm
- Forum: SD Mailing List Archive
- Topic: Characterizing System Dynamics
- Replies: 33
- Views: 31383
Characterizing System Dynamics
Posted by Bill Braun <bbraun@hlthsys.com> I suggest the addition of emergence, where observed behavior is not described by any of the rules that give rise to the behavior; ref. the ""boids"" metaphor. Bill Braun Posted by Bill Braun <bbraun@hlthsys.com> posting date Thu, 17 Nov 2...
- Mon Oct 17, 2005 12:00 pm
- Forum: SD Mailing List Archive
- Topic: Pre-simulation indicators of usefulness
- Replies: 10
- Views: 8806
Pre-simulation indicators of usefulness
Posted by Bill Braun <bbraun@hlthsys.com> Jim Thompson wants to know what I'm serving for breakfast. It's a good question. Putting my suggestion in the context of a ""messy complicated problem that has resisted solutions"" I would probably have to admit, ""watered down ...
- Mon Oct 17, 2005 11:48 am
- Forum: SD Mailing List Archive
- Topic: MIN/MAX Functions
- Replies: 8
- Views: 10856
MIN/MAX Functions
Posted by Bill Braun <bbraun@hlthsys.com> In Jim Hines' workshop at ISDC 2005 in Boston there was brief discussion of the MIN and MAX function and their use in preventing a stock from going negative (where such a thing could not happen in reality, such as potential customers). The point, as I unders...
- Sat Oct 15, 2005 12:50 pm
- Forum: SD Mailing List Archive
- Topic: Pre-simulation indicators of usefulness
- Replies: 10
- Views: 8806
Pre-simulation indicators of usefulness
Posted by Bill Braun <bbraun@hlthsys.com> Causal loop diagrams are a good tool start that conversation. I ask students to state the problem as they perceive it (their mental model of the problem symptom) and then to form an hypothesis of what is giving rise to the problem symptom in the first place ...
- Sat Oct 01, 2005 12:39 pm
- Forum: SD Mailing List Archive
- Topic: Order of delays
- Replies: 2
- Views: 3676
Order of delays
Posted by Bill Braun <bbraun@hlthsys.com> Is there a general rule of thumb for discerning the difference between modeling a series of first order delays and using an Nth order delay? For example, as an over simplification, an order structure could be described as: SIP = SIP + dt * (PO - PR) where PO...
- Sat Sep 17, 2005 2:14 pm
- Forum: SD Mailing List Archive
- Topic: Order of a system
- Replies: 6
- Views: 5413
Order of a system
Posted by Bill Braun <bbraun@hlthsys.com> In Business Dynamics, p. 264, Sterman notes that, ""the order of a dynamic system or loop is the number of state variables, or stocks, it contains"". I've always understood this to exclude stocks that were simply sinks that accumulate act...
- Sat Sep 17, 2005 2:06 pm
- Forum: SD Mailing List Archive
- Topic: All models are wrong (was Strategy magazine article about Ja
- Replies: 16
- Views: 11294
All models are wrong (was Strategy magazine article about Ja
Posted by Bill Braun <bbraun@hlthsys.com>
Noting that ""all models are incomplete, some are useful"" has been received well and understood for the most part.
Bill Braun
Posted by Bill Braun <bbraun@hlthsys.com>
posting date Fri, 16 Sep 2005 07:38:00 -0500
Noting that ""all models are incomplete, some are useful"" has been received well and understood for the most part.
Bill Braun
Posted by Bill Braun <bbraun@hlthsys.com>
posting date Fri, 16 Sep 2005 07:38:00 -0500
- Thu Sep 15, 2005 11:47 am
- Forum: SD Mailing List Archive
- Topic: Best first stock-flow model?
- Replies: 2
- Views: 3878
Best first stock-flow model?
Posted by Bill Braun <bbraun@hlthsys.com> I use two variations. In the first, I use traditional CLD modeling and put a box around stocks. It is not always real clear how the flows are connected to the stock (into and out of), but it does make accumulation explicit and students seem to be able to lat...
- Sat Aug 13, 2005 1:04 pm
- Forum: SD Mailing List Archive
- Topic: Feedback Thinking for Business? (Was Feedback and Behavior)
- Replies: 8
- Views: 7366
Feedback Thinking for Business?
Posted by ""Bill Braun"" <bbraun@hlthsys.com> >> I said that business people understood the concept of feed back, >> but never pretended that they understood their implication, >> particularly when there are many of them. We rely extensively on micro worlds in our graduate manage...
- Wed Aug 10, 2005 6:50 pm
- Forum: SD Mailing List Archive
- Topic: Feedback and Behavior
- Replies: 24
- Views: 65459
Feedback and Behavior
Posted by ""Bill Braun"" <bbraun@hlthsys.com> >From the pen of: Jean-Jacques Laublé jean-jacques.lauble wanadoo.fr >> When I build a model, I always start with a no stock, no loop model, unless >> the necessity to have one stock is evident. It looks then like a common >> influenc...
- Fri Jul 29, 2005 12:13 pm
- Forum: SD Mailing List Archive
- Topic: Marketing driven growth and decline
- Replies: 15
- Views: 9406
Marketing driven growth and decline
Posted by Bill Braun <bbraun@hlthsys.com> At 06:26 AM 7/26/2005 -0400, Kim Warren wrote: >>Secondly, I am not sure it is common for customers to be lost *because* >>they were not marketed to. Customers leave a supplier for other reasons, >>such as price, quality problems, competitors' efforts and so...
- Wed Jul 20, 2005 11:28 am
- Forum: SD Mailing List Archive
- Topic: Measuring Systems Thinking Abilities
- Replies: 12
- Views: 9427
Measuring Systems Thinking Abilities
Posted by Bill Braun <bbraun@hlthsys.com> Hello Martin, I can do no better at finding the intersection between the academic and the pragmatic than John Gunkler's comments. John presents a continuum of views of systems thinking that should serve you well. Good advice to boot. Bill Braun Posted by Bil...