Search found 20 matches

by George Richardson <gpr@albany
Wed Jan 28, 2009 4:54 pm
Forum: 2008-2009
Topic: ANNOUNCE Search for Director of CTG
Replies: 0
Views: 42924

ANNOUNCE Search for Director of CTG

Posted by George Richardson <gpr@albany.edu> [The SD Mailing list is closing. Please go to=20 http://www.systemdynamics.org/forum to post announcements and continue the discussion ] =20 Announcement of Professional Vacancy Director of the Center for Technology in Government The University at Albany ...
by George Richardson <gpr@albany
Sun May 11, 2008 7:13 am
Forum: 2008-2009
Topic: QUERY Models, Problems and Systems
Replies: 29
Views: 5202

QUERY Models, Problems and Systems

Posted by George Richardson <gpr@albany.edu> The suggestion that we can ""model systems"" seems to me like the assignments that buffaloed me when I was an undergraduate: ""Write a 2000-word essay on Hamlet,"" or ""...19th century England,"" or ""...the U.S. criminal justice system."" I remember doin...
by George Richardson <gpr@albany
Tue Apr 22, 2008 7:23 am
Forum: 2008-2009
Topic: QUERY Meaning of Stock/Level
Replies: 46
Views: 8229

QUERY Meaning of Stock/Level

Posted by George Richardson <gpr@albany.edu> On Apr 21, 2008, at 6:38 AM, SDMAIL Jack Harich wrote: > Maybe it's more like nouns versus verbs. Variables that are verbs > (rates) have a unit per time period, like persons/year. Nouns have only > the unit, like persons. Verbs cannot be a stock, but nou...
by George Richardson <gpr@albany
Fri Apr 11, 2008 7:10 am
Forum: 2008-2009
Topic: QUERY Meaning of Stock/Level
Replies: 46
Views: 8229

QUERY Meaning of Stock/Level

Posted by George Richardson <gpr@albany.edu> On Apr 9, 2008, at 7:59 AM, SDMAIL Alan McLucas wrote: > ""Trust"" is an intangible which > cannot be represented by this integral equation. Therefore, we cannot > build system dynamics models that contain stocks of intangibles such as > ""trust"". I appr...
by George Richardson <gpr@albany
Thu Apr 03, 2008 6:27 am
Forum: 2008-2009
Topic: QUERY Definition of exogenous
Replies: 5
Views: 2349

QUERY Definition of exogenous

Posted by George Richardson <gpr@albany.edu> Jean wrote: > I have thought during the week end about what is exactly an exogenous > variable. I found that I had not like you a clear understanding of > what it was exactly. A good first cut at what the concepts ""endogenous"" and ""exogenous"" mean is ...
by George Richardson <gpr@albany
Tue Jan 08, 2008 7:00 am
Forum: 2008-2009
Topic: QUERY Discrete event software (002)
Replies: 13
Views: 2894

QUERY Discrete event software (002)

Posted by George Richardson <gpr@albany.edu> Beyond the questions of software and integration of approaches are questions about the nature of ""reality"" that have puzzled me about discrete event simulation. (Of course, others have questioned the fit between reality and our continuous time, feedback...
by George Richardson <gpr@albany
Thu Dec 13, 2007 7:08 am
Forum: 2007
Topic: QUERY Policy paradox and SD
Replies: 21
Views: 8145

QUERY Policy paradox and SD

Posted by George Richardson <gpr@albany.edu> In the recent discussion on implementation one poster wrote: > The big difficulty with groups, is that most people will not be ready to > express publicly their intimate interests, supposing they are > conscious of them. > So I do not believe much in grou...
by George Richardson <gpr@albany
Thu Nov 29, 2007 8:19 am
Forum: 2007
Topic: QUERY Running beer game in 1.5 hours
Replies: 7
Views: 4520

QUERY Running beer game in 1.5 hours

Posted by George Richardson <gpr@albany.edu> A good debrief of the beer game takes an hour-and-a-half by itself, so I'd say don't even try to run the game and debrief it in 1.5 hours. There a layers of insights from the game, from surface thoughts about the availability of information to very deep t...
by George Richardson <gpr@albany
Fri Oct 05, 2007 7:24 am
Forum: 2007
Topic: QUERY Structural changes and validity
Replies: 17
Views: 3040

QUERY Structural changes and validity

Posted by George Richardson <gpr@albany.edu> The writer of this query suggests that system dynamics can not be effective in dealing with social problems because we don't know future social system structure. It's worse than that, I suppose, because we can't even know current social system structure f...
by George Richardson <gpr@albany
Fri Oct 05, 2007 7:24 am
Forum: 2007
Topic: QUERY Structural changes and validity
Replies: 17
Views: 3040

QUERY Structural changes and validity

Posted by George Richardson <gpr@albany.edu> The writer of this query suggests that system dynamics can not be effective in dealing with social problems because we don't know future social system structure. It's worse than that, I suppose, because we can't even know current social system structure f...
by George Richardson <gpr@albany
Wed Oct 03, 2007 7:21 am
Forum: 2007
Topic: QUERY World3 on one page
Replies: 2
Views: 1701

QUERY World3 on one page

Posted by George Richardson <gpr@albany.edu> On Oct 2, 2007, at 8:00 AM, SDMAIL Jason Foster wrote: > As part of my lecturing, I was hoping to find a graphical depiction of > the World3 model that all appears on one page. On pp. 132-133 of Randers 1980 book Elements of the System Dynamics Method, th...
by George Richardson <gpr@albany
Wed Oct 03, 2007 7:21 am
Forum: 2007
Topic: QUERY World3 on one page
Replies: 2
Views: 1701

QUERY World3 on one page

Posted by George Richardson <gpr@albany.edu> On Oct 2, 2007, at 8:00 AM, SDMAIL Jason Foster wrote: > As part of my lecturing, I was hoping to find a graphical depiction of > the World3 model that all appears on one page. On pp. 132-133 of Randers 1980 book Elements of the System Dynamics Method, th...
by George Richardson <gpr@albany
Mon Sep 10, 2007 8:01 pm
Forum: 2007
Topic: QUERY Getting a Good Problem Statement
Replies: 36
Views: 5534

QUERY Getting a Good Problem Statement

Posted by George Richardson <gpr@albany.edu> On Sep 8, 2007, at 7:10 AM, SDMAIL Jim Hines wrote: > You're right that defining a problem in terms of reference modes > pre-supposes that people have already decided to use SD. I don't think that's quite right. It presupposes that you want to address a d...
by George Richardson <gpr@albany
Tue Sep 04, 2007 2:09 pm
Forum: 2007
Topic: QUERY How to promote good work
Replies: 26
Views: 6846

QUERY How to promote good work (SD6555)

Posted by George Richardson <gpr@albany.edu> On Sep 3, 2007, at 8:26 AM, SDMAIL Richard Stevenson wrote: > Today I received several personal emails from SD mail subscribers > around the world who all (my summary) said, ""we have given up > subscribing to this forum because many people consider the S...
by George Richardson <gpr@albany
Tue Sep 04, 2007 2:09 pm
Forum: 2007
Topic: QUERY Getting a Good Problem Statement
Replies: 36
Views: 5534

QUERY Getting a Good Problem Statement (SD6528)

Posted by George Richardson <gpr@albany.edu> On Sep 2, 2007, at 7:38 AM, SDMAIL David Rees wrote: > Posted by ""David Rees"" <david.rees@hpls.co.nz> > > While concept models are an important part of developing > understanding and engagement in the SD process it seems to me that > they sit around ste...
by George Richardson <gpr@albany
Sun Apr 22, 2007 2:13 pm
Forum: 2007
Topic: QUERY Age of material in a stock
Replies: 28
Views: 6851

QUERY Age of material in a stock

Posted by George Richardson <gpr@albany.edu> >On Apr 20, 2007, at 5:33 AM, SDMAIL Jay W. Forrester wrote: > Can someone supply some examples of where the way of computing age in >a stock will alter the direction of policy recommendations to improve >the behavior of a system? Great question. We have ...
by George Richardson <gpr@albany
Fri Apr 06, 2007 12:49 pm
Forum: 2007
Topic: QUERY Renaming System Dynamics (was Capitalize System Dynami
Replies: 24
Views: 4240

QUERY Renaming System Dynamics (was Capitalize System Dynami

Posted by George Richardson <gpr@albany.edu> >On Apr 5, 2007, at 6:04 AM, SDMAIL ybarlas wrote: > how about sysdyn? (A sysdyn method, sysdyn model, sysdyn approach...) Things come around. Here's a minor historical note: ""Sysdyn"" was the name I gave to the program of subroutines I wrote in BASIC in...
by George Richardson <gpr@albany
Sat Mar 24, 2007 11:27 am
Forum: 2007
Topic: QUERY Please Capitalize System Dynamics
Replies: 18
Views: 3641

QUERY Please Capitalize System Dynamics

Posted by George Richardson <gpr@albany.edu> Lots if interesting, sophisticated thoughts here. I wonder if we might take a rather simple (unsophisticated?) instrumental approach. Suppose we think that in something we are writing ""system dynamics"" (small S, small D) would be interpreted not as a fi...
by George Richardson <gpr@albany
Wed Mar 07, 2007 5:26 pm
Forum: 2007
Topic: QUERY Volunteer Dynamics
Replies: 5
Views: 1925

QUERY Volunteer Dynamics

Posted by George Richardson <gpr@albany.edu> On Mar 6, 2007, at 5:25 AM, System Dynamics Mailing List wrote: > Posted by ""Megan Hopper"" <mhopper83@hotmail.com> I was wondering if > anyone has seen SD research about volunteering. My first thoughts on this interesting question are that there's a lot...
by George Richardson <gpr@albany
Wed Feb 07, 2007 12:29 pm
Forum: 2007
Topic: QUERY Structural or Behavioral Theory
Replies: 5
Views: 2112

QUERY Structural or Behavioral Theory

Posted by George Richardson <gpr@albany.edu> > SD has been regarded as a useful framework for theory development. > Why is a theory created under this paradigm often called a theory of > behavior? Why is the same theory not called a theory of structure? I think we do tend to think of model structure...