Systems and methods for parallel, discrete, simulations include functional capabilities to incorporate one or more human operators or actors into the simulation process. Such individuals can be presented situations where one or more decisions are necessary with respect to ongoing events. Entered decisions are incorporated into simulated events and activities being simulated. These in turn influence the behavior of those entities and also initiate the occurrence of other time-based processes. An architecture artifact or product can be automatically created or updated by recording how a sequence of events took place. The creation of sections of the DoDAF OV-6C Operational Event Trace architectural diagram, for the executable architecture model, can be automatically performed to dynamically provide event traces in response to a live exercise.