Search found 19 matches

by Bill Harris bill_harris facilita
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 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...
by Bill Harris bill_harris facilita
Mon Feb 27, 2006 1:01 pm
Forum: SD Mailing List Archive
Topic: Fuel Distribution logistics
Replies: 2
Views: 3929

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...
by Bill Harris bill_harris facilita
Wed Feb 08, 2006 1:05 pm
Forum: SD Mailing List Archive
Topic: Changing Structure Dynamically
Replies: 2
Views: 3467

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 > > ...
by Bill Harris bill_harris facilita
Thu Jan 05, 2006 4:14 pm
Forum: SD Mailing List Archive
Topic: The Logical Framework and SD
Replies: 6
Views: 10140

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...
by Bill Harris bill_harris facilita
Thu Jan 05, 2006 4:12 pm
Forum: SD Mailing List Archive
Topic: Combining Discrete and Continous
Replies: 10
Views: 13139

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...
by Bill Harris bill_harris facilita
Mon Jan 02, 2006 11:55 am
Forum: SD Mailing List Archive
Topic: The Logical Framework and SD
Replies: 6
Views: 10140

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...
by Bill Harris bill_harris facilita
Sat Dec 31, 2005 2:32 pm
Forum: SD Mailing List Archive
Topic: Combining Discrete and Continous
Replies: 10
Views: 13139

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...
by Bill Harris bill_harris facilita
Sat Dec 24, 2005 8:06 pm
Forum: SD Mailing List Archive
Topic: SD and other modelling approaches
Replies: 41
Views: 40297

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...
by Bill Harris bill_harris facilita
Wed Dec 21, 2005 11:59 am
Forum: SD Mailing List Archive
Topic: SD and other modelling approaches
Replies: 41
Views: 40297

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 ...
by Bill Harris bill_harris facilita
Sat Dec 03, 2005 12:57 pm
Forum: SD Mailing List Archive
Topic: Characterizing System Dynamics
Replies: 33
Views: 31376

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...
by Bill Harris bill_harris facilita
Sat Nov 19, 2005 12:58 pm
Forum: SD Mailing List Archive
Topic: Characterizing System Dynamics
Replies: 33
Views: 31376

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...
by Bill Harris bill_harris facilita
Sat Aug 13, 2005 1:01 pm
Forum: SD Mailing List Archive
Topic: Group size and beer game results
Replies: 4
Views: 5480

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...
by Bill Harris bill_harris facilita
Tue Aug 09, 2005 11:47 am
Forum: SD Mailing List Archive
Topic: Feedback and Behavior
Replies: 24
Views: 65458

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...
by Bill Harris bill_harris facilita
Sat May 14, 2005 12:31 pm
Forum: SD Mailing List Archive
Topic: Mental model creation process
Replies: 7
Views: 6189

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...
by Bill Harris bill_harris facilita
Sat May 07, 2005 1:02 pm
Forum: SD Mailing List Archive
Topic: Presenting SD for the first time
Replies: 4
Views: 4745

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...
by Bill Harris bill_harris facilita
Fri Apr 22, 2005 1:02 pm
Forum: SD Mailing List Archive
Topic: Problem Solving versus Optimization
Replies: 8
Views: 7509

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 (...
by Bill Harris bill_harris facilita
Tue Apr 12, 2005 11:35 am
Forum: SD Mailing List Archive
Topic: Evaluating expected modeling benefits
Replies: 15
Views: 18623

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...
by Bill Harris bill_harris facilita
Thu Apr 07, 2005 1:33 pm
Forum: SD Mailing List Archive
Topic: How best to handle ratios in a model?
Replies: 11
Views: 7297

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...
by Bill Harris bill_harris facilita
Sat Feb 12, 2005 12:38 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE Interact XML and DTD samples
Replies: 5
Views: 4269

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...