Ventana software support forum

Hi everybody. Mike Bean, is right when he says that a model based on a real example is much more complicated then those found in text books. He is for instance considering the telephone service contracts and rent a car service. But in the rent a car service, there is great difference in a short term...

Hi Gordon I am answering lately to your mail, because I hoped that somebody more competent than me would reply. May be in the course of the study of your problem somebody will take the train later on. First is the model of the same kind of the one found at the end of the Stermans book chapter dealin...

Hi Vittorio I feel not being and by far the more qualified to give you an answer, having never used a model with a word of mouth hypothesis. I have the same kind of problem then you. I am working currently on a price setting problem, and one of the hypotheses included in the layered diagram represen...

Hi Alan I understand perfectly your argumentation and I agree. The interest of the A implies B implies not B implies not A, is to reject a hypothesis because there is a great probability that it is false. It is particularly useful in SD, where the only thing possible is to reject a model, while prov...

Hi Carolus There seems to be some atmosphere in that (too ?) serious list. I wondered if I could demonstrate with your new LEGAL logic that my grand mother was a cow. I hope that you will excuse me: I am joking. The assertion (A implies B) implies (not A implies not B) and reciprocally is a basic fr...

Hi Jim The 1,2,3,4 is what I effectively use with some modifications and it does not annoy me at all. This is why models are wrong. And I am not sure that it horrifies a statistician if you explain him that you have not the pretension to certify that the A hypothesis is true and you use the 1,2,3,4 ...

Hi Arne

Excellent proposition. Sd is to my opinion a versatile tool
that will proove depending on the subject that after all everybody is right
and wrong.

Regards.

From: =?iso-8859-1?Q?Jean-Jacques_Laubl=E9?= <JEAN-JACQUES.LAUBLE@WANADOO.FR>

Hi John I do not agree with your opinions about processes and goals. First point. The reason of Toyotas strategy is not automatically the result of the philosophical question: to what extent fixing goals can change the results of a process? If Toyotas president did not mind his shares market it was ...

Hi John (Gunkler) About the few variables that can explain the apparently chaotic behaviour of the influence of satisfaction on productivity, they are not so few. There are family, educational, character, financial, professional, environment and personal variables (age for instance) etc... So you en...

Hi John (Swanson) I am not a consultant, but have been dealing lots of time with consultants. The reaction of clients about consultants comes from their very defaults. They first do not take the time to understand what is really the clients problem, but are too much concerned by looking clever, havi...

Hi Fabian I thank you for your suggestions. But I fear that the message I wanted to deliver was not clear enough; probably too long and too complicate. I tried to express it more shortly so that it can eventually be better understood. What I wanted to say is that it may be more effective when dealin...

Hi Bill I am not sure to have well understood your remark about random occurrences. I think that randomness has a lot to do with the question relating behavioural correctness and utility. I think that there are two kind of utilities or outcome: results or understanding or both. If the outcome is und...

Hi Mike and everybody. As I have understood the question SD is getting interested in cosmogony. I think that the SD being mainly the study of feedbacks, the question is: Is any influence of something on something else belonging to a feedback that after a time influences back the first thing? Another...

Hi Tuomo Your problem has too something to do with the general discussion about continuous, discrete time or event. Suppose that every period of time, say a day, there is an average of 100 people coming to make a trip. The capacity of the mean of communication is 100. A continuous deterministic mode...

Hi Timothy I did not understand if you did model correctly your problem, and what method or software you used, or what method is supposed to be used if you did not . I have the same kind of problem than yours. I have a rental car company, and I try to model the way people reserve cars, depending on ...

Hi Rutger The best link I know is simply the SD society web site http://www.systemdynamics.org There is plenty of information, but it needs time to explore. I found information in the short bibiliography chapter where there are 7076 references. You can download it, and open it with Word for instance...