Another research direction is to perform a good sensitivity analysis of inventory models. For example, cardenasBarron made a sensitivity analysis for the EOQ and EPQ inventory models considering two without/with backorders backorder costs (linear and fixed). On the other hand. it is important to point out that another type of sensitivity analysis to the ECQEPQ inventory models with backorders can be done in line of the works of Borgonovo and Peccati Borgonovo , and Borgonovo and Peccati just to name a few.