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Human realibility is a big tricky problem. Human failure rates depend on three main factors, namely intrinsic, work environment, and stress. PT. X is a supplier for PT. LG Indonesia manufacturing products made from plastics. Human Realibility Assesment is conducted using HEART methods (Human Error Assessment and Reduction Technique). In the first phase, task analysis on operators’ activities is done using Hierarchical Task Analysis (HTA). The largest Human Error Probability was found when Operator No. 1 did not insert the flash side carefully. The value of this probability is 0.53424. This factor is concluded as the main cause to shroud defectives, which results in customer penalyzing the company.