A note on "Optimal inventory model for items with imperfect quality and shortage backordering"

Wee et al. (2007) developed an optimal inventory model. In this technical note, we point out a contradiction between Wee et al.ʹs model and their assumption. A corrected model is developed based on their assumption. Numerical examples show that in terms of the two decision variables, there is a significant difference between the corrected model and Wee et al.ʹs model. The results also show that that the penalty of using Wee et al.ʹs model can be significant under certain situations.