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This research used a qualitative descriptive approach, namely by describing and analyzing the problems found. Qualitative research is based on primary data and secondary data. Primary data in this research was obtained by conducting observations, interviews, and documentation, while secondary data was obtained through books, previous research, and articles related to research. The aim of this research is to determine the application of 4S principles by vocational employees at PT From the results of this research, it can be seen that PT This can be seen from the lack of implementation of other 4S aspects.

Budaya kerja merupakan seperangkat perilaku yang melekat pada setiap individu di seluruh organisasi. Membangun budaya juga berarti memupuk dan memelihara aspek-aspek positif dan berusaha membiasakan perilaku tertentu untuk menciptakan bentuk baru yang lebih baik. Penelitian ini dengan berlandaskan teori Takashi Osada (1994) tentang Budaya Kerja berkonsep 5S diantaranya Seiri, Seiton, Seiso, Seiketsu dan Seitsuke. Jenis penelitian yang digunakan adalah penelitian deskriptif kualitatif. Metode penelitian pada penelitian kualitatif yang digunakan dalam penelitian ini adalah ethnography. Adapun pembahasan yang didapat beserta kesimpulan nya adalah penerapan budaya kerja 5S di PT. XYZ Otomotif Karawang masih dilakukan secara parsial dan bersifat personal pada semua tahapan proses produksi, pihak yang terlibat dalam penerapan budaya kerja 5S adalah bersifat personal hanya karyawan tertentu yang ada di tiap tahapan proses produksi.

PT KMPI is an industrial company that produces textiles and plastics, including plastic products made of polypropylene (PP). The problem that occurs in PT Kusuma Mulia Plasindo Infitex is the quality of the products that still have defects, based on the results of the analysis in February 2023 with a total production of 76,596 kg there are rejects data of 4,695 kg and the percentage of product defects that occur is 6.1%. The objective of this study is to determine the predominant types of defects that influence the factors that cause defects. This study uses the seven tools method to find the root cause of the problem to be solved, as well as the Kaizen Five-M checklist and the Kaizen Five Step Plan to suggest improvements to the company. Based on the results of data processing, there are three types of defects, namely wrinkle defects with a percentage of 43% for a total defect of 2039 kg, medium wrinkle defects with a percentage of 45% for a total defect of 2094 kg, and thick-thin defects with a percentage of 12% for a total defect of 562 kg. From the fishbone diagram, it can be seen that the occurrence of defects is caused by several factors, namely people, materials, methods and machines. Suggested improvements using the Kaizen Five-M checklist analysis are training and monitoring of production, implementation of SOPs (Standard Operating Procedures) established by the company, such as dosing the mixture of plastic seeds with addictive substances at a ratio of 25 Kg. 1 oz. and Kaizen management control: 1 Ons and Kaizen five-step plan management controls, namely Seiri, Seiton, Seiso, Seiketsu, Shitsuke. This includes pre-job briefings and periodic assessments, and the establishment of standard operating procedures for the supervision of single-table melting machines with a melting temperature of 160-166oC.