Monthly Archives: March 2013

(This is a description of a particular model, a simple Excel model I use for my own business development. I explain it, mostly in words, but with a couple of graphs and a bit of math. If you want to … Continue reading →

Models are often built as black boxes. A user can explore the dynamics of the model, trying different actions and viewing the results. But the internals are hidden: the user cannot see how his actions produce the results.

In 2009, Michael Dougherty and I created Mass Enrollment, an interactive simulation of the process of signing up illegal immigrants for an amnesty, should Congress pass a law granting immigration benefits to illegal immigrants. Mass Enrollment had a user interface, … Continue reading →