Sequential Dynamical Systems, Socio-Technical Simulations and Interaction Based Computing Madhav V. Marathe Basic and Applied Simulation Science (CCS-5) Los Alamos National Laboratory marathe@lanl.gov Joint work with: H.B. Hunt III,  S.S. Ravi, D.J.  Rosenkrantz and R.E. Stearns (SUNY-Albany) and group members in CCS-5