Ventana software support forum

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> PROBLEM However novice modelers carry out SD projects, they will rarely get simple models. This is a big problem when they should build a simple model. The problem has been discussed in the recent issues of SDR, but its root cause has not yet been cl...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> For over fifty years, a number of SD projects have been involved in the reproduction of problematic behaviors. Rarely has SD been used for point prediction, particularly when what to be reproduced are not reference modes but 'reference points'--the v...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> The lack of formal SD education has been deemed as a reason why there are too many models that do not meet SD experts' minimum standard of quality. Here, there is a tendency to restrict the application of SD to ""SD problems""--un...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> Dear all, Structural confirmation is a primary test of model validity. If model components and equations can be easily recognized, the model would pass this test. This is not a strong test. A big problem occurs when policies are easily recognized but...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> Dear all, Structual validation is key to the success of model development. However, we have no test to determine whether a given model structure is stable over the time horizon of interest. Basic mechanisms may at best represent the ""past ...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> Dear all, Structual validation is key to the success of model development. However, we have no test to determine whether a given model structure is stable over the time horizon of interest. Basic mechanisms may at best represent the ""past ...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> Dear Sir, In an evaluation of public policy, there are four analyses: public hearing, cost-benefit analysis, technical feasibility study, and system dynamic modeling. >From system dynamics' perspective, which analysis should be given a serious consid...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> I am reading the introductory book by Nancy Roberts and others. They stress the importance of policy choices in system dynamics. So let's me apply the concept to this issue. There are options to solve the searching problem. Renaming is a policy choic...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> WAS Please Capitalize System Dynamics (SD6350) Toward the new name, I suggest one name for the field. System dynamics may become 'systemdynamics'. The advantages of this term are as follows: 1. The term has already entered common parlance among syste...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> Fields like servomechanism and cybernetics have no problem with the usage of their names. There are two things in common. 1. Use single term as the fields' names 2. Be dictionary entries. System dynamics, by contrast, lacks these properties. Two word...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> I strongly agree with Bob that, fundamentally, good system dynamics is simply good science. Reproducibility is vital to good science. What is the scientific method in SD? We know how to predict the implication of a given policy, but this is still unc...

Posted by Monte Kietpawpan <kietpawpan@yahoo.com> SD has been regarded as a useful framework for theory development. Why is a theory created under this paradigm often called a theory of behavior? Why is the same theory not called a theory of structure? If scientific theories must explain why things ...