DOI: 10.4018/IJSDS.2017100105 International Journal of Strategic Decision Sciences Volume 8 • Issue 4 • October-December 2017 Copyright © 2017, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Lean Policies in Route Planning and Scheduling of Waste Collection with Fuzzy Demand Masoud Rabbani, School of Industrial and Systems Engineering, College of Engineering, University of Tehran, Iran Shadi Sadri, Department of Industrial Engineering, Amirkabir University of Technology, Tehran, Iran ABSTRACT This study addresses a household waste collection routing problem with a heterogeneous fleet. The collection fleet includes hand carts and vehicles to transport wastes from houses to disposal sites. The authors attempt to enhance the system efficiency considering lean policies, which leads to minimizing the fleet size and the collection time concurrently. In reality, uncertainty of some parameters stems from environmental and living conditions. Hence, a bi-objective fuzzy possibilistic mixed integer linear programming model is developed to design an optimal collection network. To solve the model, a hybrid solution approach is applied, which combines fuzzy possibilistic programming and fuzzy multi-objective programming. Finally, several numerical examples are tested to illustrate validation of the proposed model and applicability of the applied solution approach. KeyWoRDS Fuzzy Possibilistic Programming, Lean Policies, Vehicle Routing Problem, Waste Management 1. INTRoDUCTIoN In recent years, the importance of a healthy environment necessitates municipalities to assess applicability of the associated waste collection system. Logistics system is a major compartment in waste management involves high cost. Optimal routing is a challenge in designing a transportation system with the aim of reducing traffic and travel time, while maximizing the efficiency of the transportation system. According to waste type, collection activities are divided into three major areas: Commercial, Residential and Roll-on-roll-off (Wy et al., 2013). Each category has different characteristics related to waste volume, required collection frequency, and traveling distance. Commercial waste collection includes servicing restaurants, big malls and office buildings, while the residential waste collection serves the households. Roll-on-Roll-off waste collection activities are noticeably different from the other two areas. This type of wastes consists chemical and industrial remains derived from industrial activities. Collection activities are one of the major and costly operational services that growing environmental concerns gradually enforce municipalities to schedule properly. The advent of the lean concept in both production and service made a great evolution in customer expectations related to when and how receive the product or service. The major approach in the application of the lean policies is enhancing the efficiency and effectiveness of the system through 102