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This paper examines batch scheduling problem that has batching and sequencing in single formulationfor multiple-item case. The first step is to develop a model for single item single resource discussed in Zahedi(2008). The model determined batch sizes and their schedule simultaneously in single item case. This paperdevelops the model and algorithm for multiple-item case. The model functions to minimize total actual flowtimes. An algorithm for the model is developed using a relaxation of the binary constraints. The binary valuesfor the decision variables are obtained from steps provided in algorithm. A numerical experience showingcharacteristics of this problem is presented.

Integer Relaxation on Binary Quadratic Programming for Batching and Sequencing in Single Formulation to Minimize Total Actual Flow Times Criteria