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This paper focuses on the planning and scheduling problems in disassembly systems, in which used or end-of-life products are disassembled into basic parts and subassemblies for both economic and environmental reasons. The disassembly planning includes product representation, disassembly sequencing with disassembly level and end-of-life options, and related product design/redesign issues, while the disassembly scheduling is the problem of determining the order quantity of the used product to fulfil the demand of disassembled parts and subassemblies. This paper presents a review of the state-of-the-art articles and suggests the corresponding further research directions. The research directions suggested in this paper can be summarized as