Search found 19 matches
- Sat May 20, 2006 12:44 pm
- Forum: SD Mailing List Archive
- Topic: QUERY Pedagogical Causal Loop Diagrams
- Replies: 2
- Views: 3957
QUERY Pedagogical Causal Loop Diagrams
Posted by Bill Harris <bill_harris@facilitatedsystems.com> Will, I'm not 100% sure of what you're asking; perhaps you can clarify. Since you mentioned a Web page below, perhaps it would be useful to create a common space where you and others can draw CLDs or other diagrams and share them. For exampl...
- Mon Feb 27, 2006 1:01 pm
- Forum: SD Mailing List Archive
- Topic: Fuel Distribution logistics
- Replies: 2
- Views: 4081
Fuel Distribution logistics
Posted by Bill Harris <bill_harris@facilitatedsystems.com> >> I doubt if you are modeling the right problem when you are talking >> about the CURRENT problem of constrained oil supply. I'm afraid I would agree. I published quite a simple model three years ago (http://www.pegasuscom.com/aar/model5.ht...
- Wed Feb 08, 2006 1:05 pm
- Forum: SD Mailing List Archive
- Topic: Changing Structure Dynamically
- Replies: 2
- Views: 3484
Changing Structure Dynamically
Posted by Bill Harris <bill_harris@facilitatedsystems.com> Peter, Welcome back to SD! > > I've got a question: Is there a form of SD that is capable of > > changing a model on the fly? That is, can a system add a new flow, > > for example, as the result of some change in the value of one of the > > ...
- Thu Jan 05, 2006 4:14 pm
- Forum: SD Mailing List Archive
- Topic: The Logical Framework and SD
- Replies: 6
- Views: 10560
The Logical Framework and SD
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Jean-Jacques Laublé jean-jacques.lauble wanadoo.fr"" <system-dynamics@VENSIM.COM> writes: >> A second idea about complexity it that one of the main idea behind SD >> is that it simplifies reality. Jay Forrester spoke ab...
- Thu Jan 05, 2006 4:12 pm
- Forum: SD Mailing List Archive
- Topic: Combining Discrete and Continous
- Replies: 10
- Views: 13685
Combining Discrete and Continous
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Jean-Jacques Laublé jean-jacques.lauble wanadoo.fr"" <system-dynamics@VENSIM.COM> writes: >> It is a question of definition. >> ... >> In Powersim you can by example integrate discreete events and you can >> do it in Ve...
- Mon Jan 02, 2006 11:55 am
- Forum: SD Mailing List Archive
- Topic: The Logical Framework and SD
- Replies: 6
- Views: 10560
The Logical Framework and SD
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Keith Linard klin4960 bigpond.net.au"" <system-dynamics@VENSIM.COM> writes: >> How do we get to these markets when they don't come to the >> International System Dynamics Conferences? Present SDM papers at >> Evaluation...
- Sat Dec 31, 2005 2:32 pm
- Forum: SD Mailing List Archive
- Topic: Combining Discrete and Continous
- Replies: 10
- Views: 13685
Combining Discrete and Continous
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Louis Macovsky Dynamic BioSystems dynbiosys verizon.net"" writes: >> Have any of you used a hybrid of discrete event modeling with SD? Lou, While I know what you mean, I view discrete (vs. continuous) and SD (vs. non-SD...
- Sat Dec 24, 2005 8:06 pm
- Forum: SD Mailing List Archive
- Topic: SD and other modelling approaches
- Replies: 41
- Views: 41688
SD and other modelling approaches
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""geoff coyle geoff.coyle btinternet.com"" <system-dynamics@VENSIM.COM> writes: >> I think that you are broadly right, though you still imply that the >> task is to 'sell' SD. Of course, it is a wonderful method when >> p...
- Wed Dec 21, 2005 11:59 am
- Forum: SD Mailing List Archive
- Topic: SD and other modelling approaches
- Replies: 41
- Views: 41688
SD and other modelling approaches
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""geoff coyle geoff.coyle btinternet.com"" <system-dynamics@VENSIM.COM> writes: >> We cannot wish these phenomena away, neither can we avoid them by >> huddling together in what other people see as a closed and exclusive ...
- Sat Dec 03, 2005 12:57 pm
- Forum: SD Mailing List Archive
- Topic: Characterizing System Dynamics
- Replies: 33
- Views: 32534
Characterizing System Dynamics
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Kim Warren Kim strategydynamics.com"" <system-dynamics@VENSIM.COM> writes: >> This poses >> the question of whether we have either [a] excited people about the >> simple qualitative feedback view of their world, but not...
- Sat Nov 19, 2005 12:58 pm
- Forum: SD Mailing List Archive
- Topic: Characterizing System Dynamics
- Replies: 33
- Views: 32534
Characterizing System Dynamics
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""R.M.Mooy telecom.tno.nl"" <system-dynamics@VENSIM.COM> writes: >> What are fundamental properties of the method of Systems Thinking >> and/or System Dynamics? I've composed a list of properties that may >> be defined wi...
- Sat Aug 13, 2005 1:01 pm
- Forum: SD Mailing List Archive
- Topic: Group size and beer game results
- Replies: 4
- Views: 5535
Group size and beer game results
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Natarajan R C cnutraj mail.tapmi.org"" <system-dynamics@VENSIM.COM> writes: >> It will be interesting for those who use beer game, to test what happens >> if the game is played in two phases: Phase 1 of rounds 1 to 20 a...
- Tue Aug 09, 2005 11:47 am
- Forum: SD Mailing List Archive
- Topic: Feedback and Behavior
- Replies: 24
- Views: 65786
Feedback and Behavior
Posted by Bill Harris <bill_harris@facilitatedsystems.com> >> Posted by Joel Rahn <jrahn@sympatico.ca> >> Without feedback, a variable can only be changed exogenously: either it >> is described by a time series of data or it is the result of the >> influence of one or more variables described by dat...
- Sat May 14, 2005 12:31 pm
- Forum: SD Mailing List Archive
- Topic: Mental model creation process
- Replies: 7
- Views: 6270
Mental model creation process
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Thompson James. P (Jim) A142 Jim.Thompson CIGNA.COM"" <system-dynamics@VENSIM.COM> writes: >> In brief, we make sense of an experience by fitting it with other >> experiences. If a new experience makes sense ("&quo...
- Sat May 07, 2005 1:02 pm
- Forum: SD Mailing List Archive
- Topic: Presenting SD for the first time
- Replies: 4
- Views: 4783
Presenting SD for the first time
Posted by Bill Harris <bill_harris@facilitatedsystems.com> Chander, Best wishes as you begin to use a new tool in your work. I've written two articles on this subject that might be of use. ""A Heretical Word on Selling Systems Thinking to Your Manager"" is freely available; you h...
- Fri Apr 22, 2005 1:02 pm
- Forum: SD Mailing List Archive
- Topic: Problem Solving versus Optimization
- Replies: 8
- Views: 7566
Problem Solving versus Optimization
Posted by Bill Harris <bill_harris@facilitatedsystems.com> >> Now, this is of course what many or most >> system dynamicists do. My point is that we may become even better at this if >> we frame our problem statements in terms of multicriteria optimisation. I've found the ideas behind soft systems (...
- Tue Apr 12, 2005 11:35 am
- Forum: SD Mailing List Archive
- Topic: Evaluating expected modeling benefits
- Replies: 15
- Views: 18759
Evaluating expected modeling benefits
Posted by Bill Harris <bill_harris@facilitatedsystems.com> ""Jean-Jacques Laublé jean-jacques.lauble wanadoo.fr"" <system-dynamics@VENSIM.COM> writes: >> I noticed 8 drawbacks with SD, and managed to reduce seven of them but >> I have still to work on the one I consider as the pr...
- Thu Apr 07, 2005 1:33 pm
- Forum: SD Mailing List Archive
- Topic: How best to handle ratios in a model?
- Replies: 11
- Views: 7371
How best to handle ratios in a model?
Posted by Bill Harris <bill_harris@facilitatedsystems.com> >> ... The specific >> instance I am thinking of is if both are approaching zero then where we >> might expect a ratio of 1/1 we can easily get some very different outcomes. >> Some modification of the ratio is called for.... How would the p...
- Sat Feb 12, 2005 12:38 pm
- Forum: SD Mailing List Archive
- Topic: ANNOUNCE Interact XML and DTD samples
- Replies: 5
- Views: 4311
ANNOUNCE Interact XML and DTD samples
Posted by Bill Harris <bill_harris@facilitatedsystems.com> Tasso, Thanks for getting this going! >> I would like to ask for your feedback, please: comments, questions, >> ideas, suggestions, etc. Take my comments as from a relative novice at xml and all the associated technology. The <about/> tag se...