The vector discrete-event system (VDES) is a compact serial discrete-e
vent system model, in which the system state is represented by a vecto
r with integer components and the transitions by integer vector additi
on [13], [14]. Continuing the study of VDES, we introduce in this pape
r concurrent VDES, extending the base VDES model to capture strict con
currency, or possible simultaneity of events. We characterize the effe
ct of strict concurrency on control, and show how to synthesize nondet
erministic controllers allowing maximal concurrency of a controlled VD
ES plant.