'Consignment stock (CS)' policy is widely applied in industrial relationships today. It reduces the vendor's holding costs by stocking its inventory at a cheaper location (the buyer) and guarantees the buyer an uninterrupted supply. Studies that investigated the CS problem have adopted a...

This paper extends a recent work that investigated a single-stage production-inventory model with reworks and planned backorders by fuzzifying its input parameters. The graded mean integration representation (GMIR) method, a useful and effective defuzzification method, is employed to develop a...