IJIEM (Indonesian Journal of Industrial Engineering & Management) Vol 4 No 1 February 2023, 18-27 18 Implementation of Tree Diagram Method, Failure Mode Effect Analysis (FMEA) and 5W 1H to Reduce Corky Defective Products in PT. XYZ Mohamad Solihudin*, Wakhid Nurhidayat, Suwandi, Candra Setia Bakti, Rachmat, Agus Hari Hadi, Sapta Nugroho Universitas Yuppentek Indonesia, Kampus 2, Jl. Veteran Raya No.1 Babakan Tangerang, Banten ARTICLE INFORMATION ABSTRACT Article history: Received: 21 September 2022 Revised: 25 November 2022 Accepted: 29 November 2022 Category: Research paper PT XYZ is a company that manufactures of tire fabrics in the Tangerang. Global competition force the company continues to strive to reduce process costs, one of which is by reducing the highest percentage of defects, namely corky defects, corky defects reach 39.7% of total defects. The tree diagram and FMEA methods, selected for the analysis of potential failures that cause corky defects are found namely: Threads are not clamped when changing pots, joints are not pulled at the beginning of running, roll regulator worn is used for the process, dirty of roll regulator is used for the process, wrong setting inner brake. The 5W 1H method results from corrective actions, namely: Refreshing programs for twisting production operators, checking periodically the roll regulator used by the process is still good, making schedules, and reporting on the implementation of cleaning roll regulators and evaluating by production leaders. From the corrective actions taken, it succeeded in reducing the percentage of corky defects in the twisting plant 2 process, down from 39.7% to 14.9% in semester 2 of 2021. Keyword: Corky defect Tree diagram FMEA Potential failures 5W 1H Corresponding Author Mohamad Solihudin E-mail: soleh0282@gmail.com This is an open access article under the CC–BY-NC license. 1. INTRODUCTION Every business that is established must have the same goal of ensuring its survival through the achievement of optimal profits. The global competition that occurs today forces companies to be faced with very competitive competition in the sustainability process and make a profit. The competition requires companies to be creative in pursuing ways to survive either by increasing sales profits or reducing the cost of the production process. PT. XYZ is a company that manufactures of tire fabrics in the Tangerang. Today's global market competition forces the company to continue to strive to reduce the cost of the production process, one of which is by reducing the percentage of defects that occur in the twisting process, namely the process of twisting several threads that will become cords to increase their physical properties. The result of the twisting process is in the form of a twisted cord rolled on the paper tube with a certain color. Available online at: http://publikasi.mercubuana.ac.id/index.php/ijiem IJIEM (Indonesian Journal of Industrial Engineering & Management) ISSN (Print) : 2614-7327 ISSN (Online) : 2745-9063 DOI: 10.22441/ijiem.v4i1.17237 How to Cite: Solihudin, M., Nurhidayat, W., Suwandi, S., Bakti, C. S., Rachmat, R., Hadi, A. H., & Nugroho, S. (2023). Implementation of Tree Diagram Method, Failure Mode Effect Analysis (FMEA), and 5W 1H to Reduce Corky Defective Products in PT. XYZ. IJIEM (Indonesian Journal of Industrial Engineering & Management), 4(1), 18-27. https://doi.org/10.22441/ijiem.v4i1.17237