Ventana software support forum

I have no problems with the way the limits model boundary is defined with respect to its reference mode and its implicit and explicit assumptions. However, the reference mode it considered was rather local and it did not subsume the multiple patterns implicit in the variety of scenarios expounded in...

To add a few words to the very comprehensive response from George, GST people now seem to make a distinction between "concrete systems" and "abstract systems". Concrete systems are the panacea supposed to embody some 20 or so functions considered common to all systems, abstract s...

I like George Richardsons response to Gary Bells reference to "generations." However, to infer that there is no difference in the modeling practices of today and the past spells stagnation and an absence of evolution in the field, which is not true. Perhaps we do have several generations o...

David, Great course outline. I particulary like the clear statement of pre-requisites, which should allow you to cover the agenda you have outlined. In my experience students with limited skills in the pre-req areas can not only be frustrated with the modeling chores, they may also greatly limit pro...

It seems to me that John and Jim are perceiving each others definition of data differently, although advocating the same thing - a rigorous fit of the model to the problem addressed. Having seen Johns work on fitting historical data to validate model behavior, my impression is that John did not seek...

I wish to add to Jacks comment that reference mode is a pattern not numbers, although numbers may describe this pattern. Data for reference mode may reside in numbers or in qualitative information but it must be able to deliver the pattern in question. Discerning this pattern is really a modeling pr...

Mr Szulanski, John Nyhart at Sloan School at MIT has attempted to demonstrate SD modeling approach for use in negotiation in the international conflict resolution context. I do not know how far the approach was actually applied. I have been involved with one negotiation exercise in industry, but the...

As someone who has very diligently gone over the various versions of the world model and its critiques, I have been following the discussion on the Limits study with interest. I still continue to value highly the contributions made by the Limits study almost a quarter of a century before the environ...

I think SD is ideally suited to negotiation and contract design. I have come accross some instances of its use for that purpose, but public record of this is rare since client privilege may often not allow this. Khalid saeed@ait.ac.th Professor Khalid Saeed Infrastructure Planning & Management S...

Re Definition of Feedback, may I refer the readers again to George Richardsons book: Feedback Thought in Social Science and Systems Theory. Philadelphia: University of Pennsylvania Press (1991). Khalid Khalid Saeed Infrastructure Planning & Management School of Civil Engineering ASIAN INSTITUTE ...

for GONZALEZ R ENRIQUE A: you might wish to look at a thesis done by one of my students in 1986: Tanvir Ahmad. 1986. An assessment of the performance of just-in-time production system: A susyem dynamics approach. AIT Research Study No. IE-86-3. This can be obtained from AIT library, which can be acc...

for Tjark Struif Bontkes You will probably end up with a stiff model if you try to combine weekly and yearly dynamics, irrespective of the software or language you program your problem in. A numerical soultion for this model through simulation will offer many unsurmountable problems. You might, alte...

>German Gonzalez message # SD0205, See also: Shimada, Toshiro. 1969. Industrial Dynamics Model of Weekly Stock Prices: A Case Study. In E. B. Roberts (ed). Managerial Applications of System Dynamics. Reprinted. Productivity Press. 1991. Weerawat, Tasawate. 1993. Stock Price Behavior in a Thai Compan...

I have tried to model the growth of bureaucracy in professional organizations and how it can lead to organizational demise with particular reference to the developing countries. Most readers of the account of this model feel that the developing country distinction is artificial. This distinction, ho...

A comprehensive reference might be Bill Schaffers Ph.D. thesis on criminal justice, MIT 1977? I regret I cannot recall the exact reference. Khalid saeed@ait.ac.th Khalid Saeed Infrastructure Planning & Management School of Civil Engineering ASIAN INSTITUTE OF TECHNOLOGY G.P.O. Box 2754, Bangkok,...

The Infrastructure Planning and Management program at AIT is entering its second year and we are preparing to recruit our second batch of students. Last year 11 students were selected from an application base of about 70 to join the program against our targeted recruitment of 10. These students are ...

To: Jay Forrest: First of all, the resource problem, from SD perspective is not finding the demand and the supply and exogeneously attempting to match them. The two will eventually match. The problem is to have them do so without catastrophe through influencing day-by-day decisions. You should caref...