Search found 61 matches

by Jean-Jacques Laublé <jean-jac
Thu Jul 03, 2008 6:47 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129344

QUERY Society Strategy Development

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Everybody I belong to the many people who follow this thread and feel embarrassed by adding one more suggestion. I expressed right at the start of the thread my wish that SD may become more practical and used on problems that can be s...
by Jean-Jacques Laublé <jean-jac
Thu May 08, 2008 7:08 am
Forum: SD Mailing List Archive
Topic: QUERY Models, Problems and Systems
Replies: 29
Views: 79931

QUERY Models, Problems and Systems

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Kim I have a different understanding of the mantra : model the problem and not the system. Of course some years ago, I did not understand this the same way I understand it to day from the lessons of experience. I try strictly to model...
by Jean-Jacques Laublé <jean-jac
Wed Apr 16, 2008 6:42 am
Forum: SD Mailing List Archive
Topic: QUERY Meaning of Stock/Level
Replies: 46
Views: 36564

QUERY Meaning of Stock/Level

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> High Jay You write > Jean-Jacques' logic >of striving to make the soft variable dependent on hard variables strikes >me as an appropriate ambition. I try to make 'soft variable' dependant on hard one's. But it is not always possible. And...
by Jean-Jacques Laublé <jean-jac
Tue Apr 15, 2008 7:16 am
Forum: SD Mailing List Archive
Topic: QUERY Meaning of Stock/Level
Replies: 46
Views: 36564

QUERY Meaning of Stock/Level

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi every body. I use a soft variable if I feel that it is a useful addition to the model: it means that it increases its usefulness. This is the first consideration, whatever the technical problems that it may generate. It is unfortunate...
by Jean-Jacques Laublé <jean-jac
Sun Apr 06, 2008 5:52 am
Forum: SD Mailing List Archive
Topic: QUERY Who wants to share models
Replies: 24
Views: 23018

QUERY Who wants to share models

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Martin What would be interesting, is a place where anybody with a real world problem could submit it and have people working freely to solve it working together. The motivation of these people would be to learn. There could be differe...
by Jean-Jacques Laublé <jean-jac
Fri Apr 04, 2008 6:31 am
Forum: SD Mailing List Archive
Topic: QUERY Definition of exogenous
Replies: 5
Views: 7253

QUERY Definition of exogenous

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Geroge, Thanks for the clarification, both simple, intuitive and formal of an exogenous or endogenous variable. Jean-Jacques Laublé. Eurli Allocar Strasbourg France Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> postin...
by Jean-Jacques Laublé <jean-jac
Wed Apr 02, 2008 6:01 am
Forum: SD Mailing List Archive
Topic: QUERY Society Strategy Development
Replies: 127
Views: 129344

QUERY Society Strategy Development

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody. My wish would be for the field to be more practically used, especially in France where it is very weakly practised. I might add that the difficulty is not to set an objective but to know how to reach it and for that to unde...
by Jean-Jacques Laublé <jean-jac
Tue Apr 01, 2008 6:46 am
Forum: SD Mailing List Archive
Topic: QUERY Definition of exogenous
Replies: 5
Views: 7253

QUERY Definition of exogenous

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Bill You write <And perhaps my understanding of exogenous is dead wrong. I draw a <distinction between constants that represent behavior over which <decision makers have no control and parameters which are dimensions of <policy or dec...
by Jean-Jacques Laublé <jean-jac
Tue Mar 25, 2008 7:16 am
Forum: SD Mailing List Archive
Topic: QUERY Definition of root cause
Replies: 34
Views: 28644

QUERY Definition of root cause

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Bill You write <To what degree ought we think of an exogenous parameter as a root cause <and/or as a high leverage variable, and correspondingly construct models <based on that? An exogenous factor can be a root cause of the behaviour...
by Jean-Jacques Laublé <jean-jac
Thu Mar 20, 2008 7:43 am
Forum: SD Mailing List Archive
Topic: QUERY Definition of root cause
Replies: 34
Views: 28644

QUERY Definition of root cause

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Jack. This is a very theoretical discussion, and I try to apply SD to very concrete problems. I think that to illustrate your ideas and to prove that they can have a practical application, it would be a good idea to show an example ev...
by Jean-Jacques Laublé <jean-jac
Wed Mar 19, 2008 7:09 am
Forum: SD Mailing List Archive
Topic: QUERY Innovation and business focus
Replies: 1
Views: 3650

QUERY Innovation and business focus

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Andreas and Anders What do you think that SD will provide comparing with the multiple decision analysis tools like MCDA, decision tree analysis etc. Where is the obvious dynamic in the problem? Regards. Jean-Jacques Laublé Eurli Alloc...
by Jean-Jacques Laublé <jean-jac
Sun Mar 09, 2008 7:57 am
Forum: SD Mailing List Archive
Topic: QUERY Open Source Simulation Software for SD
Replies: 22
Views: 22221

QUERY Open Source Simulation Software for SD

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi every body I agree with both Richard's when they say that software companies must have a return from their effort and that nothing is gratuitous. The minimum that should be accessible is the code of the application and a sufficient do...
by Jean-Jacques Laublé <jean-jac
Sat Feb 23, 2008 8:39 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15906

QUERY The Minimum Acceptable Model Standard

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody. Tom Forrest writes : <methodological <scrutiny is sadly lacking. If a paper is about a model, then it ought to have <a dynamic hypothesis, reference modes, and policy analysis or <recommendations. I agree with the first par...
by Jean-Jacques Laublé <jean-jac
Thu Feb 21, 2008 7:34 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15906

QUERY The Minimum Acceptable Model Standard

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody Concerning the possibility to read models from the conference, it seems that even if it is possible to read models with Studio reader, the reader from Powersim does not allow to look at the structure of the model, nor at the...
by Jean-Jacques Laublé <jean-jac
Wed Feb 20, 2008 7:51 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15906

QUERY The Minimum Acceptable Model Standard

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Tom I agree with you that it is easy to criticize and difficult to find solutions. Particularly in the context of the SD conference where the objective of the papers seem more to be published than to be read. In your minimum recommend...
by Jean-Jacques Laublé <jean-jac
Mon Feb 18, 2008 8:31 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15906

QUERY The Minimum Acceptable Model Standard

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody. The last two threads were dealing with model quality. I do not think that the model quality is the priority for SD. I will take the first example I have mentioned in my previous post to illustrate the point. I hope the auth...
by Jean-Jacques Laublé <jean-jac
Sun Feb 17, 2008 7:53 am
Forum: SD Mailing List Archive
Topic: QUERY Do marginal models marginalize modeling?
Replies: 13
Views: 11091

QUERY Do marginal models marginalize modeling?

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Monte. I answer rather lately to your post. You write. > Here, there is a tendency to restrict the application > of SD to ""SD problems""--undesired patterns of change that can be > plotted against time. To other p...
by Jean-Jacques Laublé <jean-jac
Sat Feb 16, 2008 7:54 am
Forum: SD Mailing List Archive
Topic: QUERY The Minimum Acceptable Model Standard
Replies: 18
Views: 15906

QUERY The Minimum Acceptable Model Standard

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody As Sheldon Friedman noticed, there is a lack of transparency in SD. But to what point is it possible to avoid it? As the tools become more and more powerful, the models become more and more obscure, and people rely probably ...
by Jean-Jacques Laublé <jean-jac
Tue Feb 12, 2008 6:30 am
Forum: SD Mailing List Archive
Topic: QUERY Do marginal models marginalize modeling?
Replies: 13
Views: 11091

QUERY Do marginal models marginalize modeling?

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody. Different remarks concerning this thread. First about how a reader can interpret an SD article in a paper. There are two things that can change the way the paper will be considered by a reader. The first is the reader's kno...
by Jean-Jacques Laublé <jean-jac
Fri Dec 14, 2007 7:35 am
Forum: SD Mailing List Archive
Topic: QUERY Policy paradox and SD
Replies: 21
Views: 22038

QUERY Policy paradox and SD

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody. Fred Nickols mentionned the lack of information about implementation. It would be interesting too that people discuss about the justification of using SD and the expected added value of studying the problem dynamically with...
by Jean-Jacques Laublé <jean-jac
Tue Dec 11, 2007 8:04 am
Forum: SD Mailing List Archive
Topic: QUERY Policy paradox and SD
Replies: 21
Views: 22038

QUERY Policy paradox and SD

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Monte. The practicalities of implementation should be exposed in the definition of the problem being modelled. It is not always done. For instance in the World model, there is no reference made to the easiness of implementation of eve...
by Jean-Jacques Laublé <jean-jac
Mon Nov 19, 2007 6:57 am
Forum: SD Mailing List Archive
Topic: QUERY Subjective and objective synthesis
Replies: 2
Views: 6009

QUERY Subjective and objective synthesis

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Bill Thank you for your reply. I think that I did not formulate well enough my question. The question was not if it is necessary to progress step by step, which is often preferable (not always) and is largely dependant on the circumst...
by Jean-Jacques Laublé <jean-jac
Sat Nov 17, 2007 8:24 am
Forum: SD Mailing List Archive
Topic: QUERY Subjective and objective synthesis
Replies: 2
Views: 6009

QUERY Subjective and objective synthesis

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody Even after having studied quite a long time SD, by books, articles, distant courses, there is something that I do not understand at all. It is the relation between the subjective and the objective part of a model. The subjec...
by Jean-Jacques Laublé <jean-jac
Tue Nov 13, 2007 8:39 am
Forum: SD Mailing List Archive
Topic: QUERY Ensuring Quality of Models
Replies: 13
Views: 15092

QUERY Ensuring Quality of Models

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi Richard About your question: What procedures do people use to ensure that the model formulation, testing, evaluations cycle is done in a rigorous manner? How could that be improved? Like Fabian, I think that there is no real answer to...
by Jean-Jacques Laublé <jean-jac
Tue Nov 13, 2007 8:39 am
Forum: SD Mailing List Archive
Topic: QUERY Simplifying qualitative feed back loops
Replies: 0
Views: 4957

QUERY Simplifying qualitative feed back loops

Posted by Jean-Jacques Laublé <jean-jacques.lauble@wanadoo.fr> Hi everybody. Is there anybody that can tell me where to look (books, papers anything) to find some ideas about how to increase the qualitative understanding of a stock and flow diagram? Increase of qualitative understanding means being ...