T he problems faced by PT. TIJ is that there are still a large number of product defects. Based on the company's historical data for June - August 2022, the average product return in one month, especially for the LC brand, which is caused by defects, is 100 - 1000 units. Defects with these numbers cause losses to the company in terms of productivity and costs. This research was conducted with the aim of minimizing the number of defects in the LC brand women's bag product. This research was conducted using the Plan-Do-Check-Act (PDCA) method and the Human Error Assessment and Reduction Technique (HEART). The PDCA method is a series of flowcharts throughout the research process from defining and planning problem identification (plan), suggesting improvements and implementing results (do), controlling and evaluating the implementation of results (check) and actions taken from the results of the evaluation (act). The HEART method is also included in a series of problem identification definitions and plans (plans) that function to calculate the Human Error Probability (HEP). The calculation of this HEP value will be recapitulated from the highest to the lowest value. In this study, the three highest HEP values were taken for the pre-assembling, painting and installation of accessories to make suggestions for improvements. Based on calculations using the HEART method, the highest HEP value for possible error from the Pre-Assembling process is 0.75264, for the painting process is 0.6912 and for the accessories installation process is 0.9424. The highest possible error value of each process will be proposed for improvement using the 5W+1H method which is included in the do series. The proposed improvements are training for operators, machine maintenance checklist sheets, Quality Control plan and tool design. The proposed improvements will be re-evaluated to address the problems identified so that this series of research helps companies to improve the quality of their women's bag products, especially LC.