Technical note on inventory model with trapezoidal type demand

This note is a response to optimal policy for deteriorating items with trapezoidal type demand and partial backlogging by Cheng et al. 4]. In the above mentioned paper, a new inventory model was created, but both their model and their solution procedure contained some questionable results. In this note a detailed examination of their paper will be provided, offering an enhancement to their important inventory model and solution procedure. Numerical examples and detailed analysis of the four scenarios are used to illustrate our findings.