Discrete-event simulation (DES) was selected as the primary modeling methodology because the operational structure of the developed inventory system is fundamentally event-driven in nature. According to Banks and Law, discrete-event simulation represents systems whose state changes occur at discrete points in time as a consequence of operational events. Within the developed model, customer arrivals, replenishment-order generation, inventory transfers, lead-time completions, and inventory updates all occur as discrete operational events throughout the simulation horizon.