A production process will not be free of difficulties with faulty goods during its implementation; this is a problem that is a major factor in the production process; if the process still has many problems with product defects, the process has not been adequately regulated. Moving on from the issues raised above, the author did research at UD. Meurah Mulia, a paving stone manufacturer. For the time being, the control process in the manufacturing process is inspection control, which is an inspection that just distinguishes good and faulty goods without improving the process. In this scenario, the authors advise using the Six Sigma approach to eliminate flaws, which is a process control method that can affect decisions connected to product manufacturing, namely the production and insfection functions. The results of the analysis through processing with the Six Sigma method, which goes through five stages, namely define, measure, analyze, improve, and control, show that the current control process is ineffective, as evidenced by the occurrence of numerous defects in the manufacturing of Paving Blocks.

The Nagan Raya steam power plant 2x110 Megawatt is one of the power plants owned by PT. PLN (Persero) located in Aceh. The Nagan Raya steam power plant that operates continuously is often failure. An overhaul of maintenance activities that lasted only six months was the cause of frequent disruptions or failures. Performance evaluation in terms of reliability is urgently needed to minimize the failure. This study aims to determine the level of reliability and preventive maintenance time based on Monte Carlo simulation to the nine critical components of the boiler section. Monte Carlo simulations are used to predict precise maintenance time and future reliability values. Monte Carlo simulation results on nine important components of the boiler section, maintenance time is required within 40 days to 86 days of maintenance with a reliability value of 31% to 38%.

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This paper uses break-even analysis to determine the cost of producing patchouli oil in Kete Nilam Hijo (KNH). KNH is an industry engaged in the refining process of patchouli oil, located in South Aceh Regency, Indonesia. One obstacle faced by the KNH is that the costs of producing patchouli oil are not yet known. So far, KNH has never made economic calculations in producing patchouli oil. KNH only relies on production based on profit so that profits are not maximized and always fluctuates. In addition, the break-even point for the production of patchouli oil is also not known with certainty. To determine the break-even point, total costs and total revenue will be calculated first. This research was conducted in several stages, namely preliminary study, data collection, data processing, analysis of results, and finally concluding the results of the study. The results showed that the total production cost of patchouli oil refining at KNH in one year was 1,120,018,250 rupiah. Meanwhile, KNH had to sell 1,600 kilograms of patchouli oil to break-even.