### Determination Of Economic Production Lot Size For Multi-stage Imperfection Processes Using Material Flow Cost Accounting Framework

#### Abstract

This research proposes a new mathematical model to find lot size for multi-stage processes in with imperfection by using Material Flow Cost Accounting (MFCA) framework. The proposed model takes into account the work in process cost, inventory cost, setup cost, energy cost, material cost, and quality cost. The traditional design costs of manufacturing, processing were integrated with environmental costs and quality costs. The concept of MFCA positive and negative product costs were used to allocate the total cost and divide into positive and negative product costs .The actual process of sewing machine part consisting of 8 steps. The optimization model was formulated with the objective function to maximize total positive cost form PSO based heuristic.

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