The economic lot-sizing problem with remanufacturing and heterogeneous returns

In this project we address an extension of the economic lot-sizing problem with remanufacturing in which the returns are assumed of heterogeneous quality. Costs for remanufacturing and holding inventory depend on the quality of the returns. We study the problem under different assumptions on the cost structure in order to provide mathematical formulations, state properties about the form of its optimal solutions and suggest solution procedures.