yes - etqf is a lookup - that is actually the equation syntax.
BTW I forgot to mention this but if you use this formulation you should raise the baseline quality lookup since all movement from that will be downward.
Formulating a rising goal
Hi Ralf
If you find modelling difficult, it is because you are trying to work with models whose size is
beyond your own level of ability to understand the behaviour of a model.
About the prog.mdl Bob was writing about, you had better first understand fully how it works (and not working with it like a black box but understanding intuitively the full behaviour of the model and with various hypothesis and parameter values, which means working with it extensively and a sufficient long time) before adding little step by little step some additional material.
Regards.
JJ
[Edited on 16-6-2008 by LAUJJL]
[Edited on 16-6-2008 by LAUJJL]
If you find modelling difficult, it is because you are trying to work with models whose size is
beyond your own level of ability to understand the behaviour of a model.
About the prog.mdl Bob was writing about, you had better first understand fully how it works (and not working with it like a black box but understanding intuitively the full behaviour of the model and with various hypothesis and parameter values, which means working with it extensively and a sufficient long time) before adding little step by little step some additional material.
Regards.
JJ
[Edited on 16-6-2008 by LAUJJL]
[Edited on 16-6-2008 by LAUJJL]
Hi Jean-Jacques,
hi Bob,
thanks for your comments, hints and advice on my questions.
Sounds like we are coming to a point on how get deeper knowledge of how models (=simulations) work and what assumptions stay behind its equations, connections and reactions seen.
In which way could this be achieved in a collaborative way, discussing the points of question with a broad and diverse bunch of people (like a wiki, electronic whiteboard, others?)?
How could we grab the collective wisdom that is all around the SD world in the heads of systemdynamicists?
Perhaps I am asking strange questions, I don't know (at least there haven't been any answers to it yet, as far as I know).
What do you think?
Cheers,
Ralf
PS.: Having lots of fun learning, stumbling, stand up again, taking a new route constantly having the future vision in the head:)
hi Bob,
thanks for your comments, hints and advice on my questions.
Sounds like we are coming to a point on how get deeper knowledge of how models (=simulations) work and what assumptions stay behind its equations, connections and reactions seen.
In which way could this be achieved in a collaborative way, discussing the points of question with a broad and diverse bunch of people (like a wiki, electronic whiteboard, others?)?
How could we grab the collective wisdom that is all around the SD world in the heads of systemdynamicists?
Perhaps I am asking strange questions, I don't know (at least there haven't been any answers to it yet, as far as I know).
What do you think?
Cheers,
Ralf
PS.: Having lots of fun learning, stumbling, stand up again, taking a new route constantly having the future vision in the head:)
Ralf Lippold
Hi Ralf
I think there is no scientific answer to lyric questions like:
How could we grab the collective wisdom that is all around the SD world in the heads of systemdynamicists?
You can ask such sort of questions to philosophers and they can write tons of books and
still not solve the questions.
I think that SD must be used in a precise context, answering precise and limited questions.
You cannot make a model to make people happy or even more precisely a model that maximizes the long term benefit of a business as I have tried to do years ago.
I think that you should make your questions more specific than:
How is it possible to implement lean thinking to make it sustainable?
It is like the make people happy question, it has no answer.
Regards.
JJ
I think there is no scientific answer to lyric questions like:
How could we grab the collective wisdom that is all around the SD world in the heads of systemdynamicists?
You can ask such sort of questions to philosophers and they can write tons of books and
still not solve the questions.
I think that SD must be used in a precise context, answering precise and limited questions.
You cannot make a model to make people happy or even more precisely a model that maximizes the long term benefit of a business as I have tried to do years ago.
I think that you should make your questions more specific than:
How is it possible to implement lean thinking to make it sustainable?
It is like the make people happy question, it has no answer.
Regards.
JJ
-
bob@vensim.com
- Senior Member
- Posts: 1107
- Joined: Wed Mar 12, 2003 2:46 pm
I think JJs comments are pretty much on target. That said, many of the issues in lean thinking overlap very strongly with project models and a good foray into that would be to start with the Richardson and Pugh book, then search the system dynamics bibliography available from http://www.systemdynamics.org to find work that is more directly on topic.
Mental model to be transfered into SD model
Hi Jean-Jacques,
you are quite right.
Right now I try to understand how reality works (I had the chance to perceive people's behavior for some years and see the results of their behavior with some delay as well, coping with the results done by their actions).
It is not easy and in a way I have to get to the understanding of the model and its complexity through my own thinking nevertheless the input/questions/comments of others is very valuable.
Any comment is welcome.
Best regards,
Ralf
you are quite right.
If I don't model in a simulation then I model still in my head and as we all know the system behavior is just too complex to be coped with (even though we often think we could;-)).Originally posted by LAUJJL
Hi Ralf
If you find modelling difficult, it is because you are trying to work with models whose size is beyond your own level of ability to understand the behaviour of a model.
Right now I try to understand how reality works (I had the chance to perceive people's behavior for some years and see the results of their behavior with some delay as well, coping with the results done by their actions).
It is not easy and in a way I have to get to the understanding of the model and its complexity through my own thinking nevertheless the input/questions/comments of others is very valuable.
Any comment is welcome.
Best regards,
Ralf
Ralf Lippold
-
kristaramz
- Newbie
- Posts: 1
- Joined: Thu Dec 10, 2009 6:46 am
Simulation pret immobilier
If the stock of workload is not increasing there will be also more time for the managers to do the "walk the talk" and this will increase the learning amongst the workforce and will lead to further leveraging of the lean standards in the overall organization. If the workload is rising, then there is less time for "walk the talk" and the managers can't fulfill the appropriate amount of "walk the talk" resulting in lowering the standards and through lowering the VA/NVA ratio as well will have negative impact on the workload (as finished tasks are slowing down).
If the stock of workload is not increasing there will be also more time for the managers to do the "walk the talk" and this will increase the learning amongst the workforce and will lead to further leveraging of the lean standards in the overall organization. If the workload is rising, then there is less time for "walk the talk" and the managers can't fulfill the appropriate amount of "walk the talk" resulting in lowering the standards and through lowering the VA/NVA ratio as well will have negative impact on the workload (as finished tasks are slowing down).