Critical behavior for the model of random spatial permutations Random spatial permutations arise in the study of Bose-Einstein condensates; they are interesting as well solely from a probabilistic point of view. With points on the lattice, they are tractable (as is also the case for self-avoiding walks) from a numerical approach. We present the probability model, the phase transition, and associated order parameters, along with related known results and conjectures. We focus particularly on Markov chain Monte Carlo methods, variance estimation for correlated time series, and finite-size scaling. This is a dry run for a job talk; constructive feedback is welcome. John Kerl Mathematical Physics Seminar September 9, 2008