In discrete event simulation concurrent estimation is a technique used to estimate the effect of alternate parameter settings on a discrete event system.
For example from observation of a (computer simulated) telecommunications system with a specified buffer size
, one estimates what the performance would be if the buffer size had been set to the alternate values
Effectively the technique generates (during a single simulation run)
alternative histories for the system state variables, which have the same probability of occurring as the main simulated state path; this results in a computational saving as compared to running