In Model 5-4, the relative timings of the inventory-evaluation interval and the delivery lag were such that at no time could there be more than one order outstanding. What if the numbers were different so that there could be multiple orders on the way at a given time? Would Model 5-4 still work? (Note that in Model 5-4 we represented the order quantity, if any, by an attribute of the inventory-evaluator entity; what if that order quantity had been represented instead by a variable? Group startsYes or NoYes, unselectedNo, selectedGroup ends