In this lecture, we review results from the Monte Carlo simulation lab (Lab 3) and setup motivation for the agent-based modeling/NetLogo lab (Lab 4). For the MC-lab review, we cover the estimation of pi by drawing random coordinates in the unit cube. We also discuss the possibly counter-intuitive results from estimating the length of a 3-path stochastic activity network. To prepare for Lab 4, we review the three different types of simulation methodologies (ABM/IBM, DES, and SDM) and then give a brief introduction to NetLogo. A more detailed/tutorial introduction to NetLogo will take place during Lab 4.