Abstract
This study aims to identify the cause of defect produced at PT Purinusa Ekapersada. Quality control (QC) is a process to measure the quality of an item by comparing it according to the specifications and requirements asked by the customer, or it can be said also as an effort to maintain the quality of the goods produced in accordance with predetermined specifications based on the customer's request. The method used to reduce various types of defects produced by PT Purinusa Ekapersada was analyzed using the Pareto diagram to indicate the type of defect and the most of the control chart that produced defects were still within the control limits, a fishbone diagram describe various disabilities, and a 4M1E Why Analuysis to determine the causes and consequences of events.
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