Stress, Burnout & Biology

In my last post, stress takes center stage as both a driver and an outcome of the cortisol-cytokine-serotonin system. But stress can arise endogenously in another way as well, from the interplay of personal goals and work performance. Jack Homer’s burnout model is a system dynamics classic that everyone should explore:

Worker burnout: A dynamic model with implications for prevention and control

Jack B. Homer

This paper explores the dynamics of worker burnout, a process in which a hard‐working individual becomes increasingly exhausted, frustrated, and unproductive. The author’s own two‐year experience with repeated cycles of burnout is qualitatively reproduced by a small system dynamics model that portrays the underlying psychology of workaholism. Model tests demonstrate that the limit cycle seen in the base run can be stabilized through techniques that diminish work‐related stress or enhance relaxation. These stabilizing techniques also serve to raise overall productivity, since they support a higher level of energy and more working hours on the average. One important policy lever is the maximum workweek or work limit; an optimal work limit at which overall productivity is at its peak is shown to exist within a region of stability where burnout is avoided. The paper concludes with a strategy for preventing burnout, which emphasizes the individual’s responsibility for understanding the self‐inflicted nature of this problem and pursuing an effective course of stability.

You can find a copy of the model in the help system that comes with Vensim.


Today I was looking for DYNAMO documentation of the TRND macro. Lo and behold, has the second edition of the DYNAMO User Guide online. It reminds me that I was lucky to have missed the punch card era:

… but not quite lucky enough to miss timesharing and the teletype:

The computer under my desk today would have been the fastest in the world the year I finished my dissertation. We’ve come a long way.

Happy E day

E, a.k.a. Euler’s number or the base of the natural logarithm, is near and dear to dynamic modelers. It’s not just the root of exponential growth and decay; thanks to Euler’s Formula it encompasses oscillation, and therefore all things dynamic.

E is approximately 2.718, and today is 2/7/18, at least to Americans, so this is the biggest e day for a while. (NASA has the next 1,999,996 digits, should you need them.) Unlike π, e has not been contested in any state legislature that I know of.

Update to Path Dependence, Competition, and Succession in the Dynamics of Scientific Revolution model

For the 2017 Balaton Group meeting, I’ve updated Sterman & Wittenberg’s Path Dependence, Competition, and Succession in the Dynamics of Scientific Revolution model. The new version is far more usable, with readable variable names and improved diagrams.

This is an extremely interesting model for our current situation of clashing paradigms, fake news and filter bubbles. I encourage you to take a look at the model and paper.

This is actually much more natural as a Ventity model, so watch for another update.

Ad Experiment

In the near future I’ll be running an experiment with serving advertisements on this site, starting with Google AdSense.

This is motivated by a little bit of greed (to defray the costs of hosting) and a lot of curiosity.

  • What kind of ads will show up here?
  • Will it change my perception of this blog?
  • Will I feel any editorial pressure? (If so, the experiment ends.)

I’m generally wary of running society’s information system on a paid basis. (Recall the first deadly sin of complex system management.) On the other hand, there are certainly valid interests in sharing commercial information.

I plan to write about the outcome down the road, but first I’d like to get some firsthand experience.

What do you think?

Update: The experiment is over.