Ventana software support forum

Hello Nial, You are right: the order is not a property of the system, but of its description. Any nth-order differential equation can be re-written as a system of n first-order differential equations by a rather elementary re-definition of variables. IMHO SD models are something similar to first-ord...

Dear friends of SD related resources and math education, this is the first announcement of a special "Working Group" at the "Fifth International Conference on Technology in Mathematics Teaching" (ICTMT5), which will be held in Klagenfurt, Aug 6-9, 2001. I have the honour to chair...

Dear friends and SD-er worldwide, the spring 2000 update of the System Dynamics and Systems Thinking Mega Link List is available via http://go.just.to/sd or as usual at http://www.uni-klu.ac.at/~gossimit/links/bookmksd.htm , if you dont want to be redirected by the shortcut go.just.to link. Thank yo...

Dear SD-Community, This fascinating thread brings up some very interesting questions: 1) What is the relation between the idea of feedback and the idea of accumulation? 2) How are these concepts related to the issues of causal loop diagrams (CLD) and the system dynamics modeling (SDM) method? 3) Wha...

X-Mozilla-Status: 8001 X-Mozilla-Status2: 00000000 X-UIDL: 10316-938505322 Status: O X-Status: Dear Richard, apparently the shrimps in your lagoon change their behavior significantly over time: the young (1 - 2 months) stay in the lagoon, the older (3 months or so) emigrate to the ocean. So I think ...

Dear Mr. SalaEspiell, thank you for your very kind mail. The question you arise is really worth to be considered seriously. In my humble opinion "hard" System Dynamics (SD) is essentially a quantitative methodology. Nevertheless SDers use their tool sometimes in pretty a qualitative manner...

Dear friends of SD-related web resources, A new update of my System Dynamics / Systems Thinking Mega Link List is ready to be visited at http://www.uni-klu.ac.at/~gossimit/links/bookmksd.htm The same address can be reached via http://go.just.to/sd Thank you for almost 38.000 visits since March 1997!...