Search found 51 matches

by Bill Harris <bill_harris@faci
Mon Jan 12, 2009 7:20 am
Forum: SD Mailing List Archive
Topic: QUERY Modeling the recovery
Replies: 1
Views: 8691

QUERY Modeling the recovery

Posted by Bill Harris <bill_harris@facilitatedsystems.com> [The SD Mailing list is closing. Please go to http://www.systemdynamics.org/forum to continue the discussion ] I hope people won't consider this too self-serving, because it points to my blog, but I've started a posting called ""Qu...
by Bill Harris <bill_harris@faci
Thu Jan 08, 2009 7:20 am
Forum: SD Mailing List Archive
Topic: QUERY WikiSD, Knowledge and Communication?
Replies: 5
Views: 12909

QUERY WikiSD, Knowledge and Communication?

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL ralf_lippold"" <ralf_lippold@web.de> writes: > > The WikiSD, which Bob thankfully has set up a while ago, is -in my > > eyes- a good grassroots entry point to the field. I wonder if IP concerns are part of the is...
by Bill Harris <bill_harris@faci
Wed Dec 10, 2008 6:34 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE PCT and an economic emergency
Replies: 9
Views: 16163

ANNOUNCE PCT and an economic emergency

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Jay Forrest"" <systems@jayforrest.com> writes: > Both humans and businesses demonstrate a tendency to take recent patterns > and project them. (Most people's vision of the future is today with the > problems take...
by Bill Harris <bill_harris@faci
Tue Dec 09, 2008 7:45 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE PCT and an economic emergency
Replies: 9
Views: 16163

ANNOUNCE PCT and an economic emergency

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Tom Fiddaman"" <tom@ventanasystems.com> writes: > Where Powers really goes astray is with the notion that we can build a model, > reach consensus, and solve the problem technocratically. The system is too > compl...
by Bill Harris <bill_harris@faci
Sun Dec 07, 2008 8:26 am
Forum: SD Mailing List Archive
Topic: ANNOUNCE New SD Course of University of Wahsington
Replies: 0
Views: 8203

ANNOUNCE New SD Course of University of Wahsington

Posted by Bill Harris <bill_harris@facilitatedsystems.com> If any of you know people who live in the Puget Sound region of the northwestern United States (Seattle and its environs) and are interested in studying system dynamics, see my announcement of IMT 586 at the University of Washington at http:...
by Bill Harris <bill_harris@faci
Thu Oct 23, 2008 6:42 am
Forum: SD Mailing List Archive
Topic: QUERY Economic System
Replies: 8
Views: 8716

QUERY Economic System

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Jay Forrester"" <jforestr@MIT.EDU> writes: > > First, the current crisis did not start with the burst housing > > bubble. It started with the excessive credit that led to the > > housing bubble. Jay, Without argu...
by Bill Harris <bill_harris@faci
Wed Jul 30, 2008 7:12 am
Forum: SD Mailing List Archive
Topic: QUERY In-simulation linear programming
Replies: 4
Views: 5773

QUERY In-simulation linear programming

Posted by Bill Harris <bill_harris@facilitatedsystems.com> Hazhir, Check out Goldsim (http://www.goldsim.com/). It may be able to do what you want. Bill - -- Bill Harris Facilitated Systems Posted by Bill Harris <bill_harris@facilitatedsystems.com> posting date Tue, 29 Jul 2008 06:59:44 -0700 ______...
by Bill Harris <bill_harris@faci
Fri Jul 04, 2008 6:48 am
Forum: SD Mailing List Archive
Topic: QUERY Physiological Diabetes Models
Replies: 10
Views: 8718

QUERY Physiological Diabetes Models

Posted by Bill Harris <bill_harris@facilitatedsystems.com> Jaideep, I have no pointers to diabetes models, but you might be interested in PBPK (physiologically-based, pharmaco-kinetic) modeling. Their models look for all the world like SD models to me; indeed, MCSim, the open source simulator I've w...
by Bill Harris <bill_harris@faci
Thu Jul 03, 2008 6:47 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129275

QUERY Society Strategy Development

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL John Gunkler"" <johngunkler@comcast.net> writes: > > I support the development of a minimal set of knowledge and tools (a body of > > knowledge) for SD. With all due respect, Bill (Harris), how is this in any > >...
by Bill Harris <bill_harris@faci
Tue Jul 01, 2008 7:51 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129275

QUERY Society Strategy Development

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Johann Heymann"" <johann.heymann@fdg.co.za> writes: > > 1. Developing a formal System Dynamics Body of Knowledge (SDBOK) s > > imilar to the PMBOK of the project management fraternity; > > > > 2. Developing a SD ...
by Bill Harris <bill_harris@faci
Thu Jun 26, 2008 6:41 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129275

QUERY Society Strategy Development

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Kim Warren"" <Kim@strategydynamics.com> writes: > > I have used force-field analysis for many years, and it certainly has a > > role to play. However, that role comes later - we need an idea where we > > want to ...
by Bill Harris <bill_harris@faci
Wed May 14, 2008 7:41 am
Forum: SD Mailing List Archive
Topic: QUERY Models, Problems and Systems
Replies: 29
Views: 79824

QUERY Models, Problems and Systems

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL John Morecroft"" <jmorecroft@london.edu> writes: > > The contrast between the two examples was dramatic. Two years for a > > sector map of Digital Equipment Corporation, and eight hours for a > > close-to-complet...
by Bill Harris <bill_harris@faci
Fri Apr 25, 2008 6:34 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129275

QUERY Society Strategy Development

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Richard Stevenson"" <rstevenson@valculus.com> writes: > SD in business is currently mired between over-simplification (loosely, > systems thinking) and managerial incomprehension (loosely, strategy > dynamics). S...
by Bill Harris <bill_harris@faci
Thu Apr 24, 2008 7:35 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129275

QUERY Society Strategy Development

Posted by Bill Harris <bill_harris@facilitatedsystems.com> - From what I read of these strategy ideas, I gather that we as a group think the world of 2028 will likely be the world of 2008 with a bit more age and wisdom (especially wisdom of the sort we offer). Yet we have an early and long tradition...
by Bill Harris <bill_harris@faci
Tue Apr 22, 2008 7:23 am
Forum: SD Mailing List Archive
Topic: QUERY Meaning of Stock/Level
Replies: 46
Views: 36556

QUERY Meaning of Stock/Level

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Jack Harich"" <register@thwink.org> writes: > > 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 ""Flowing wa...
by Bill Harris <bill_harris@faci
Sat Apr 12, 2008 7:06 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129275

QUERY Society Strategy Development

Posted by Bill Harris <bill_harris@facilitatedsystems.com> > > These illustrations largely cover, like Jack's suggestion, the > > *capability* to deal with problems - can anyone offer examples of > > objectives to have *actually solved* those problems?, e.g. Kim, I started to respond and then lacked...
by Bill Harris <bill_harris@faci
Tue Apr 08, 2008 7:15 am
Forum: SD Mailing List Archive
Topic: QUERY Who wants to share models
Replies: 24
Views: 23016

QUERY Who wants to share models

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Bill Braun"" <bbraun@hlthsys.com> writes: > Dividing a model into sectors as you suggest is viable. Is that the same > as co-constructing? Is such a thing possible given the complexities of > modeling, especially...
by Bill Harris <bill_harris@faci
Fri Mar 14, 2008 7:23 am
Forum: SD Mailing List Archive
Topic: QUERY Open Source Simulation Software for SD
Replies: 22
Views: 22216

QUERY Open Source Simulation Software for SD

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Tom Fiddaman"" <tom@ventanasystems.com> writes: > In the first case, the problem is that spreadsheets are unstructured, so > there isn't an equation set to translate. Manual replication of a > spreadsheet is horr...
by Bill Harris <bill_harris@faci
Sat Mar 08, 2008 7:33 am
Forum: SD Mailing List Archive
Topic: QUERY Cassandra's curse and LTG
Replies: 0
Views: 3383

QUERY Cassandra's curse and LTG

Posted by Bill Harris <bill_harris@facilitatedsystems.com> Those who don't watch The Oil Drum regularly might find http://www.theoildrum.com/node/3551 of interest about one person's belief as to why LTG was not accepted more widely. Bill - -- Bill Harris Posted by Bill Harris <bill_harris@facilitate...
by Bill Harris <bill_harris@faci
Thu Mar 06, 2008 8:19 am
Forum: SD Mailing List Archive
Topic: QUERY Open Source Simulation Software for SD
Replies: 22
Views: 22216

QUERY Open Source Simulation Software for SD

Posted by Bill Harris <bill_harris@facilitatedsystems.com> Stefano, I think I've mentioned it here before, but, in case I haven't, I've been using MCSim, a GPL'd simulator, for I think about (actually, almost exactly) 3 years now. It comes from the PBPK (physiologically-based pharmacokinetic) world,...
by Bill Harris <bill_harris@faci
Wed Mar 05, 2008 7:31 am
Forum: SD Mailing List Archive
Topic: QUERY Carrying Capacity and Ecological Tipping Points
Replies: 0
Views: 3416

QUERY Carrying Capacity and Ecological Tipping Points

Posted by Bill Harris <bill_harris@facilitatedsystems.com> Some years ago, John Sterman pointed out a very good article in the Proceedings of the National Academy of Sciences (PNAS) that began to quantify the carrying capacity of this planet. You can find a reference to it and related articles at ht...
by Bill Harris <bill_harris@faci
Thu Feb 21, 2008 7:34 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15901

QUERY The Minimum Acceptable Model Standard

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Bill Braun"" <bbraun@hlthsys.com> writes: > > Would an open source authorship approach to this be feasible? It offers the > > possibility of moving beyond the limitations that Tom Forest cites. I am not > > knowl...
by Bill Harris <bill_harris@faci
Mon Feb 11, 2008 6:07 am
Forum: SD Mailing List Archive
Topic: QUERY Do marginal models marginalize modeling?
Replies: 13
Views: 11090

QUERY Do marginal models marginalize modeling?

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL"" <richard.dudley@attglobal.net> writes: > How do we encourage more widespread use of these, already acknowledged, > good modeling practices. > > My recent post asks if we should be commenting more on articles wh...
by Bill Harris <bill_harris@faci
Thu Jan 10, 2008 7:18 am
Forum: SD Mailing List Archive
Topic: QUERY Discrete event software (002)
Replies: 13
Views: 10940

QUERY Discrete event software (002)

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL George Richardson"" <gpr@albany.edu> writes: > Beyond the questions of software and integration of approaches are ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ George, With all the suggestions of commer...
by Bill Harris <bill_harris@faci
Mon Jan 07, 2008 9:17 am
Forum: SD Mailing List Archive
Topic: QUERY Discrete event software (002)
Replies: 13
Views: 10940

QUERY Discrete event software (002)

Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""SDMAIL Jim Thompson"" <james.thompson@strath.ac.uk> writes: > So if the problem > is policy design (say, allocation of resources) traditional SD simulation is > efficient. If the problem is policy implementation (say, t...