Quality is one of the important factors that makes a company survive in the industrial world. PT. X maintains the quality of its products by conducting quality tests on all products that will be sent to consumers. Although the quality test has been carried out on products, there are still consumers who receive defective products. To reduce product defects, a risk management approach is carried out. Risk management is a method in which organizations can identify problems with a comprehensive and systematic management approach. The method used in this study is Seven tools and House of Risk (HOR). Phase 1 of the House of Risk (HOR) method used to search for risk agents must be prioritized by looking at the value of Aggregate Risk Potential (ARP). Furthermore, the ARP value is used as input for House Of Risk phase 2 to find mitigation strategies that can be applied in the company. Based on the identification of risk events there are 24 risk events in the production process and there are 21 causes of risk (risk agents). The causes of risk that must be prioritized are 10 causes of risk with the highest ARP value of 2699, ie the operator ignores the SOP. So that the causes of risk must be prioritized for improvement. based on the analysis of the quality costs is repair product costs or rework product cost, it is focused on two products is Crb 10123-31 and Crb 01143-79 Ns.

PT. X Provides paid internet services known as Indihome. The problem that occurs in Indihome Internet service is that there are 42.36% complaints from consumers to the service process provided by PT. X and there is a 7.46% complaint about the amount of the bill. The purpose of this study is to model and know what variables affect the quality of the Indihome Internet service. The method used is Partial Least Square (PLS). Partial Least Square (PLS) is one of the multivariate statistical analysis techniques that can handle multiple response variables and an explanatory variable. The variables used are tangible, empathy, assurance, reliability and responsiveness. The results of the research are the increase of R square value after the implementation of the A5 indicator that does not meet the model PLS. All five variables affect the quality of indihome Internet service is 76,1%. Based on the hypothesis test results on the outer model It is said that the variable indicator is valid with p-value = 0 < 0,05. In testing the inner model obtained that the variable tangible and responsiveness has no significant effect on the quality of Internet service Indihome, while the variable empathy, assurance, reliability significantly affect the quality of service Indihome Internet.

How to investigate the occurrence of cavitation in the pump? Several studies have shown the sound characteristic that occurs during cavitation. This research attemps to build a pump cavitation detection system based on the audio signal of the operating pump. Audio signal is recorded using a microphone through a computer sound card. Then perform the frequency domain feature extraction and the correlation analysis for feature selection. From this process, 9 frequency domain features are selected as the artificial neural network classifier input. This artificial neural network classifier is trained with the Resilient backprogation algorithm The performance of this detection system is able to determine the existence of cavitation with an accuracy rate of 82.5%.

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