Modeling and Simulation, or ModSim for short, is a semester-long course taught every other year by Ms. Dvorsky. To take this course, Magnet Juniors and Seniors must have completed or concurrently be taking Analysis of Algorithms. Other Blair Juniors and Seniors may also take ModSim if they have completed A.P. Computer Science.

ModSim helps students understand and utilize computer models in a variety of disciplines. For example, students model a wildfire's spread, hypothetical ecosystems, wait times at stores, and other situations. Ultimately, students devise their own system to model. Choices in the past have included topics as wide ranging as life on a duck pond to traffic patterns in Blair's hallways. Some of the assignments use the STELLA modeling environment, while others require MatLab, C++, or other program languages.