Ventana software support forum

> > I am slowly moving toward your point of view. I still cannot resist the > apparent ease with which students grasp CLDs and their transition to SDMs > seems relatively painless. However, I am now wondering if going straight to > SDMs, though it may be slower on the front end, will produce richer ...

> Chief Seattle. Unfortunately the "speech" was written decades after the > chiefs death by a script writer in Hollywood. Apparently, the script > writer wrote what he thought Seattles sentiments were. There are, > however, some really interesting insights in this particular data! Thanks B...

After reading the many replies, I guess we come down to the usual sensible agreement. We agree about the appropriate use of data, but that definition of "appropriate"ness is a very subjective matter (one cohort, 4 or 100???). I have read somewhere that not even using four cohorts in the Wo...

Prof Coyle points out that there are a number of problems with using census data. Agreed, but is there a better alternative - surely it cannot be inventing numbers out of thin air. My belief is that, even if census data is lousy, knowing where it is so can make it much more valuable than using any o...

Dear SD Community: The survey on the use of SD in academia and industry is over. Much thanks to the 45 visitors (15 from Europe!!) who took part in the survey. Please see below for visitor comments. It was a first try and never meant to be the most scientific and "the ultimate" survey. The...

Bill Harris on this list can help. I found the following reference: Bill Harris 3217 102nd Place SE Facilitated Systems Everett, WA 98208 USA mailto:bill_harris@facilitatedsystems.com phone:(425) 338-0512 Of course I found reference for the article you need using the search engine on http://www.opti...

Thanks to the 32 (at the time of this writing) visitors who have completed the survey on www.optimlator.com . Thanks also for your user comments - one I specially liked is as follows: "The biggest problem with System Dynamics in the government and industry is that so few have heard of it or und...

Dear SD community: The survey on the use of SD in academia and industry is available on my website ( www.optimlator.com ) - it is simple, short (will take less than FIVE minutes of your time), subjective, and crude, as a first cut and a start. But, as system dynamicists, do we have a problem with th...

Michael: Thanks for signing the Guestbook on my site. When I used "community" as the search term on my system dynamics mailing list database search form, I got 201 results, so there is a lot of info out there that you can get from the engine. Check it out - it is in the System Dynamics pul...

Dear Ivo: A couple of points: 1. If you check the mailing list search engine on my website at www.optimlator.com you will find many previous postings on your query (one of them talks of an SD model application in Germany), for example, with "crime" you get 24 results with "police"...

Dear SD Community I have updated the search index at optimlator.com to include all posts till December 29, 1999. These new additions (about 2 months worth) are in a much cleaner format, thanks to Bob Eberleins suggestion - namely, to remove the header junk before each email and to just have the Subj...

On resource allocation of time, after GPRs idea of allocation extending to separate activities (unlike my thinking where I first suggested using optimal control to minimize TOTAL time - so-called Free Horizon problem), we have had interesting discussions. I havent looked at alloc_p yet, so my ideas ...

Have you checked Louis Alfelds Introduction to Urban Dynamics? He starts from VERY simple models, beautifully explained, and then expands them to urban models of much larger complexity. A few months back similar topics were heavily discussed here on the list - please try keyword searches (e.g. "...

Dear Steve [1] When I read "With only a given amount available, how can it (time) best be managed?" I said Aha - here we are talking about a classical optimal control problem. Actually your problem is quite a standard one in space engineering - the "minimum time" problem - if you...

Dear SD Community Greetings The search engine on my website is Netscape-ready now. www.optimlator.com For those who are not aware of this search engine - it allows you to input keywords (with Boolean operators to refine/expand searches) to search all the past system dynamics mailing list archives. B...