Browsing by Author "Mahlet, Zebenay"

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    Minimization of Defective Products in Abyssinia Tannery Industry
    (Addis Ababa University, 2019-06) Mahlet, Zebenay; Ameha, Mulugeta (PhD); Shimelis, Tilahun (Mr.) Co-Advisor
    Producing quality product is one of the major determinants that enable manufacturing organizations to compete in the global market. There are many causes for the occurrence of defective products. Hence, to avoid any further problem corrective measures should be taken. The main objective of this thesis is to develop a continuous quality improvement model that integrate lean and six sigma, which coherently applies the principles to reduce the defect level in Abyssinia Tannery Industries. The case study is mainly based on primary and secondary data sources and the main secondary data sources are company record, reports and literature review. Data collected from primary data sources are process flow, cause of defects and type of defects. And frequency of occurrence of defect, amount of lowgrade level, defect, their impact, which defect affect the company most and cost encored to treat the defective one etc. were collected from secondary sources. In addition, both qualitatively and quantitatively methods used to analyze the data and by using lean and six sigma tool and techniques. The proposed structure is built upon the existing define, measure, analyze, improve and control structure, which is well renowned in the literature. There are multidimensional causes related to human, machine, material, method, process and organizational factors for the occurrence of defect. To solve the problems associated with these causes, proactive, organized and continuous quality improvement model is required. To improve the quality by reducing defect, Integrated Continuous quality Improvement model consisting lean and six sigma developed based on case study result. Six Sigma and lean are related and share common grounds in terms of striving to achieve customer satisfaction. The integration between the two approaches is lean within six-sigma type of integration and use design of experiment and future value stream mapping for improvement purpose. Their integration is concluded to be possible and beneficial for defect reduction in Abyssinia tannery