Search found 26 matches

by Bob Eberlein <bob@vensim.com&
Wed Feb 11, 2009 2:09 pm
Forum: SD Mailing List Archive
Topic: FINAL The SD Mailing list has closed
Replies: 0
Views: 8870

FINAL The SD Mailing list has closed

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, This is the final message from the System Dynamics Mailing list. It has been great fun to watch the discussion over the last decade. To continue the conversation, please go to the forum at http://www.systemdynamics.org/forum I addition to the disc...
by Bob Eberlein <bob@vensim.com&
Sun Jan 11, 2009 10:32 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE Replacing the SD Mailing List
Replies: 0
Views: 8334

ANNOUNCE Replacing the SD Mailing List

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, I am sorry that this took so long. I have put in place a new forum that I hope will allow more flexible and complete communications. This is done as a PhpBB bulletin board and is located at: http://www.systemdynamics.org/forum Everyone can read th...
by Bob Eberlein <bob@vensim.com&
Thu Sep 04, 2008 6:06 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE Teaching Award for David Lane
Replies: 0
Views: 3338

ANNOUNCE Teaching Award for David Lane

Posted by Bob Eberlein <bob@vensim.com> Dr David Lane (Operational Research Group and Managerial Economics & Stra= tegy Group) has received a teaching excellence award for his course =91System = Dynamics Modelling=92, after students on the Masters degrees in both Operational R= esearch and Decis...
by Bob Eberlein <bob@vensim.com&
Sun Aug 03, 2008 7:33 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE ASysT Award Presented for CDC Work
Replies: 2
Views: 4130

ANNOUNCE ASysT Award Presented for CDC Work

Posted by Bob Eberlein <bob@vensim.com> Congratulations to the team on this. ----------- From: John Sterman <jsterman@MIT.EDU> Jack Homer, Drew Jones, and Gary Hirsch are three long-time SD people involved in this. Note particularly that the entire team decided to donate the full prize to support fu...
by Bob Eberlein <bob@vensim.com&
Sun Jul 20, 2008 1:20 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129245

QUERY Society Strategy Development

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, Just a few comments on the recent posts on this thread - it is one that has had a variety of subthreads but I have kept the same heading to give some continuity. There have been some good suggestions around professional activities. But many of the...
by Bob Eberlein <bob@vensim.com&
Tue Jul 08, 2008 7:02 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE Post-doc Position through USC
Replies: 0
Views: 3489

ANNOUNCE Post-doc Position through USC

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, A note via John Sterman. Bob Eberlein ---------------------------- Below a post-doc opportunity combining system dynamics, behavioral economics, and other methods to study how communities respond to disasters, both natural and man-made (e.g., terr...
by Bob Eberlein <bob@vensim.com&
Mon May 26, 2008 6:07 am
Forum: SD Mailing List Archive
Topic: QUERY Limits to Growth Plan B
Replies: 26
Views: 26339

QUERY Limits to Growth Plan B

Posted by Bob Eberlein <bob@vensim.com> The obvious answer to Khalid's post is that the positive connections from economic prosperity to population growth work through mortality and not fertility. Better economic conditions lead to longer lives, hence more people. This, unfortunately, does not lend ...
by Bob Eberlein <bob@vensim.com&
Mon Apr 14, 2008 7:57 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE WikiSD and SMILE/XMILE Forum
Replies: 0
Views: 3252

ANNOUNCE WikiSD and SMILE/XMILE Forum

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, The System Dynamics Wiki is now open for input at http://www.systemdynamics.org/wiki To edit you will need to log in using the email and the password that you use with the web submission system. If you have not logged into the web submission syste...
by Bob Eberlein <bob@vensim.com&
Fri Apr 11, 2008 7:10 am
Forum: SD Mailing List Archive
Topic: QUERY Meaning of Stock/Level
Replies: 46
Views: 36554

QUERY Meaning of Stock/Level

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, This discussion is interesting, but seems to have a lot of force in a direction I consider extremely misleading, if not simply wrong. First, the whole concept of a stock, level or state variable is an abstraction, so there is no absolute test of a...
by Bob Eberlein <bob@vensim.com&
Tue Apr 01, 2008 6:46 am
Forum: SD Mailing List Archive
Topic: QUERY Inputs for World3-2003 scenarios
Replies: 2
Views: 5109

QUERY Inputs for World3-2003 scenarios

Posted by Bob Eberlein <bob@vensim.com> Hi Jack, The change files that comes with Vensim for the 03 World3 model actually correspond to the 93 version of the model (and book) - perhaps some are even the original book. There are 13 of them corresponding to the 13 alternative scenarios in the earlier ...
by Bob Eberlein <bob@vensim.com&
Sat Feb 23, 2008 8:39 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15899

QUERY The Minimum Acceptable Model Standard

Posted by Bob Eberlein <bob@vensim.com> Hi Tom, Let me clarify a little bit my points which were not well articulated. First, people are talking about at least two different things in this thread. The intent of the original post was to ask if we can find a criteria that will allow us to actually loo...
by Bob Eberlein <bob@vensim.com&
Wed Feb 20, 2008 7:56 pm
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15899

QUERY The Minimum Acceptable Model Standard

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, Tom Forest wrote: > Where are our policy levers for this problem? I am not sure I see this as a problem, so much as an opportunity. And where I think it directly applies is in the creation of a library, if I may use the term loosely, of models add...
by Bob Eberlein <bob@vensim.com&
Fri Feb 15, 2008 6:53 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15899

QUERY The Minimum Acceptable Model Standard

Posted by Bob Eberlein <bob@vensim.com> Richard's query puts standards in a very interesting light. Both on the list and off there have been lots of discussions of model quality and standards. However, what Richard is suggesting is a very basic set of guidelines that are meant to ensure the ability ...
by Bob Eberlein <bob@vensim.com&
Tue Dec 11, 2007 8:04 am
Forum: SD Mailing List Archive
Topic: QUERY Policy paradox and SD
Replies: 21
Views: 22027

QUERY Policy paradox and SD

Posted by Bob Eberlein <bob@vensim.com> What Monte described strikes me not so much as a policy paradox as an implementation dilemma. It is definitively not unique to System Dynamics or even to the social systems. For example, we can make a pendulum swing more quickly by increasing gravity. For a ph...
by Bob Eberlein <bob@vensim.com&
Sat Dec 08, 2007 8:48 am
Forum: SD Mailing List Archive
Topic: QUERY Income based membership dues
Replies: 9
Views: 11736

QUERY Income based membership dues

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, The new dues structures was discussed at the conference this summer and formally announced in the September Newsletter. The intent was to give membership access to individuals who would not otherwise be able to afford it while not significantly im...
by Bob Eberlein <bob@vensim.com&
Thu Nov 08, 2007 7:01 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE System Zoo Books Available
Replies: 0
Views: 7531

ANNOUNCE System Zoo Books Available

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, I got a note from Hartmut Bossel that his books are now available in English. Details below. Bob Eberlein SYSTEM ZOO PUBLICATIONS by Hartmut Bossel http://www.hartmutbossel.de All English language books and CDs are available in internet and local ...
by Bob Eberlein <bob@vensim.com&
Wed Sep 19, 2007 2:19 pm
Forum: SD Mailing List Archive
Topic: QUERY "Flawless Consulting" and SD
Replies: 17
Views: 12217

QUERY ""Flawless Consulting"" and SD

Posted by Bob Eberlein <bob@vensim.com> A short comment on this. There is a lot of discussion of data in this thread but as I understand from the original query data was intended to mean all information about the problem domain, the people involved, what is at stake, how information is exchanged and...
by Bob Eberlein <bob@vensim.com&
Fri Sep 07, 2007 4:43 pm
Forum: SD Mailing List Archive
Topic: QUERY How to promote good work
Replies: 26
Views: 22035

QUERY How to promote good work

Posted by Bob Eberlein <bob@vensim.com> In a private communication Owen Ambur (Co-Chair of the StratML COP http://xml.gov/stratml/index.htm ) wrote: > Bob & Richard, it seems to me the ""place"" in which to ""bring together"" > ""suggestions for ...
by Bob Eberlein <bob@vensim.com&
Wed Sep 05, 2007 3:43 pm
Forum: SD Mailing List Archive
Topic: QUERY How to promote good work
Replies: 26
Views: 22035

QUERY How to promote good work (SD6555)

Posted by Bob Eberlein <bob@vensim.com> Mr. Stevenson is correct in saying that he has put forward some suggestions for things it would be good to have - my apologies. I thank him for bringing these together into one place. There are none of that I would disagree with and I hope that people within t...
by Bob Eberlein <bob@vensim.com&
Mon Sep 03, 2007 2:35 pm
Forum: SD Mailing List Archive
Topic: QUERY How to promote good work
Replies: 26
Views: 22035

QUERY How to promote good work (SD6555)

Posted by Bob Eberlein <bob@vensim.com> I gave Mr. Stevenson's post a constructive title, as I assume his intent was too look for good suggestions to move forward and not simply to criticize the status quo. I spoke with Jay after his speech on the next 50 years at the conference and told him I shoul...
by Bob Eberlein <bob@vensim.com&
Sun Jul 15, 2007 2:49 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE Dynamica Digital Archive (1975- 1984)
Replies: 1
Views: 3362

ANNOUNCE Dynamica Digital Archive (1975- 1984)

Posted by Bob Eberlein <bob@vensim.com> This is wonderful news about Dynamica. That, along with D-memo's, some conferenc proceedings and of course back issues of the System Dynamics Review give us a very significant archive of historic work in the field. With the help of technology, much of this wor...
by Bob Eberlein <bob@vensim.com&
Sun Apr 22, 2007 3:54 am
Forum: SD Mailing List Archive
Topic: QUERY Age of material in a stock
Replies: 28
Views: 25861

QUERY Age of material in a stock

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, I know some of us are still a little bit confused by Jack Homer's correct assertion that the average age of material in a stock and the outflow age are the same. The confusion comes because it is often easiest to think of a stock as getting distin...
by Bob Eberlein <bob@vensim.com&
Sun Mar 18, 2007 1:25 pm
Forum: SD Mailing List Archive
Topic: QUERY Please Capitalize System Dynamics
Replies: 18
Views: 13476

QUERY Please Capitalize System Dynamics

Posted by Bob Eberlein <bob@vensim.com> Bill Harris and I had a small exchange on this. Bill points out that many style guidelines push away from capilization in a case such as this (psychology, economics, quantum physics, mathematics - none use caps). But psychologists study psychology, economists ...
by Bob Eberlein <bob@vensim.com&
Thu Mar 08, 2007 1:38 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE Mailing list formatting
Replies: 0
Views: 2709

ANNOUNCE Mailing list formatting

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, A number of people have mentioned that the new from headers do not seem useful. I tend to agree. A problem with the old headers was that using reply seemed to be sending a message to a person, when in fact it was going to the list. I have changed ...
by Bob Eberlein <bob@vensim.com&
Mon Feb 12, 2007 12:48 pm
Forum: SD Mailing List Archive
Topic: QUERY Future Development Directions
Replies: 32
Views: 20559

QUERY Future Development Directions

Posted by Bob Eberlein <bob@vensim.com> Thanks Monte for pointing out the importance of reproducibility. The notion that two people faced with the same problem would create the same model and come to the same conclusion is, however, much stronger than that. An experiemnt is reproducible if other peo...