  When imperfect quality products are produced in a production process, rework
may be performed to make them become serviceable. In an inventory system, items
may deteriorate. Selling deteriorated items to customers will create negative
impact on corporate image. In this paper, two economic production quantity
(EPQ) models are proposed for deteriorating items with rework process. A single
production-rework plant system and a system consists of $n$ production plants
and one rework plant are considered. Approximated analytic results are obtained
and numerical examples are provided to illustrate the solution procedure.
