Search found 29 matches

by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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,...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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 ...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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 ...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...
by Bill Braun bbraun hlthsys.com
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...