I was reading a book on modeling and the first problem in the first chapter asked the reader to model the use of an elevator during the morning rush at an office. There was the implicit assumption that employees would only be going up, and that there wouldn’t be any intra-level travel. I though this problem was interesting, so I thought I’d start to model this with Python. (I turned out that it was a rabbit hole.) I think that this is interesting for two reasons, you can model the wait-time for a very common situation, this can be abstracted to a more general constrained resource problem. This is my first whack: