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This paper considers the hierarchical production planning (HPP) concept to solve a production planning problem in the process industry in a fuzzy environment. The adopted fuzzy HPP consists of two levels in which a fuzzy aggregate production planning (FAPP) model is developed in the first level, and then a fuzzy disaggregate production planning (FDPP) model is developed at the second level. The FAPP was reported by Omar et al.  and therefore, this research paper discusses the FDPP model. Wedoi:10.46300/9108.2021.15.2 fatcat:t7nbrod2z5ahrbg4iad57lfapa