In these cases, either the host ERP (Enterprise Resource Planning) system or the WMS (Warehouse Management System) controls inventory and is the brain of the entire warehouse. The WES (Warehouse Execution System), on the other hand, is responsible for controlling the various islands of automation to complete tasks given by the host or WMS system.
This might all seem a bit complicated at first. After all, if the WMS is like a brain, why can’t it just control everything in the warehouse on its own? Are multiple systems really better and more cost-effective than one? As I will explain below, a WES can greatly improve operations where automation is involved in many ways.