Renewing my membership in the System Dynamics Society

By Len Malczynski, VP Meetings Greetings,In 2009, at the International Conference of the System Dynamics Society, President Erling Moxnes started his Presidential address by saying, '"Groucho Marx said “I refuse to be a member of any club that would have me as member."' Erling got my attention with that paradox and his use of a … Continue reading Renewing my membership in the System Dynamics Society

Why we do not always simulate

By Vincent de Gooyert, Inge Bleijenbergh, Hubert Korzilius, Brigit Fokkinga, Monic Lansu, Stephan Raaijmakers, Etiënne Rouwette, Merel van der Wal With great interest we have been following and participating in discussions on what ‘good’ and ‘appropriate’ system dynamics modeling is. The system dynamics society, including its conferences and the wiSDom blog provide a stimulating environment … Continue reading Why we do not always simulate

What scientific rigor can and cannot buy us

By Jack Homer, VP of Professional Practice Many words have been written about how SD modeling should be scientific and rigorous.  An initial dynamic hypothesis will always have shortcomings, and these can be revealed by model testing.  We must go through an iterative process, revising a model repeatedly so that we can get the dynamic … Continue reading What scientific rigor can and cannot buy us

The endogenous perspective: a friendly amendment

By Jack Homer, VP of Professional Practice I have developed lots of SD models over the years for both private and public organizations.  My models have all been built to answer strategic questions for which there was no single obvious answer, due to the presence of dynamic complexities including accumulations, delays, nonlinearities, and feedback loops.  … Continue reading The endogenous perspective: a friendly amendment

Let’s consider policy feasibility

By Jack Homer, VP of Professional Practice I was once consulted by a semiconductor equipment maker who wanted to reduce their service maintenance costs.  The client team offered a variety of ideas, some of which were workforce-related and could be implemented fairly rapidly, while other options involved product improvement and would require several years of … Continue reading Let’s consider policy feasibility

Six Reasons to Apply System Dynamics Modeling in Medical Research

By Kenneth G. Cooper (Moderator's Note: After several recent conversations with Ken about different dimensions of SD in medical research, and as a follow-up to his recent post, I asked him to provide a short list of the top reasons why we should pursue more SD work in this area. The list below, shared with … Continue reading Six Reasons to Apply System Dynamics Modeling in Medical Research

The need for SD modeling of human biological systems and diseases

By Kenneth G. Cooper It is within our capability to reduce dramatically the long time and high cost of successful drug development for treating human disease. We can do so by adding to medical research the analysis of the elegantly complex, feedback-intensive systems of the human body—not just as a collection of components, but as … Continue reading The need for SD modeling of human biological systems and diseases

First, look at the data

By Jack Homer, VP of Professional Practice I recently received an e-mail from a college student, someone I’d never heard of before, wondering whether system dynamics was the right approach for studying a particular issue: how the government’s publication of secondary school rankings in his country might influence parents’ attitudes and behaviors.  The student wondered … Continue reading First, look at the data