In the era of globalization, the internet has become a human need in doing various things. Many internet users are an opportunity for internet service providers, PT Telekomunikasi Indonesia (Telkom). One of PT Telkom's products is IndiHome. As the only state-owned enterprise engaged in telecommunications, PT Telkom is expected to meet the needs of the Indonesian people. However, based on the rating obtained by IndiHome products through the myIndiHome application on Google Play, it is 3.5 out of 87,000 more reviews. The reviews focus on how important the effect of word-of-mouth is on choosing and using internet provider products. The review data was collected on November 1, 2020 to December 15, 2020, with a total of 2,539 reviews as a sample.  The sentiment analysis process that has been carried out shows that the number of reviews included in the negative sentiment class was 1.160 reviews, and the positive class was 1.374 reviews out of a total of 2,539 reviews. The results indicate that service errors in IndiHome services are still quite high, reaching 46.7% as indicated by the number of negative reviews. The classification results show that the average value of the total accuracy of the Support Vector Machine (SVM) method is 86.54% greater than Naïve Bayes Classifier (NBC) method which has an average total accuracy of 84.69%.  Based on fishbone diagram analysis, there are 12nd problems on negative reviews that classify problems 5P factors: Price, People, Process, Place, and Product.

CHUUO Plain Shirt Factory is a plain shirt manufacturer founded in 2016 and is located at Kaliurang road Km 9, Yogyakarta. They not only sell plain t-shirts but also sell screen printing shirts, receive screen printing services, and orders to make collared shirts (polo). For CHUUO Plain Shirt Factory, business location has an important role in the marketing process related to reaching the customers. One method that can be used to determine the location of a new business is Analytical Hierarchy Process (AHP). This study focuses on selecting the best alternative location by considering seven criteria: geography, cost, population, risk, facilities & infrastructure, availability of human resources, and developer credibility. The research method used was observation and direct interviews using a questionnaire. The result shows that alternative location A (Shop at Gejayan Road No.30) has the highest all weight evaluation value (0.45). Alternative location B (Shop at Kaliurang Road Km 4) has a value of all weight evaluation of 0.3. Alternative location C (Shop at Magelang Road Km 7) has valued all weight evaluations the lowest (0.25). Based on the analytical research conducted, it can be concluded that alternative location A (Shop at Gejayan Road No.30) is the best location to open a branch shop for CHUUO Plain Shirt Factory.

PT X is an information and communication company as well as a complete telecommunication service and network provider in Indonesia. In serving customer needs related to services, PT X has Plasa spread across 535 outlets throughout Indonesia until 2019.. Plasa is PT X outlet or place of service, which is fully managed by PT X or in cooperation with service partners. According to the explanation given by the Team Leader Plasa has service standards in serving customer needs including the standard customer service time is 10 minutes and the standard number of customers per CSR is 15 customers. But at PT X Yogyakarta the system actually only has one Customer Service to serve 50 customers and the service time sometimes exceeds the predetermined time standard. This resulted in quite long queues and long waiting times. The purpose of this research is to know the appropriate queue simulation model using flexim 6.0 so that waiting time at Plasa can be minimized. The average waiting time required by customers in the queuing system at Plasa is 3248.44 seconds and based on the alternatives that have been made, it can be seen that experiment 1 is the best, this is because the maximum waiting time achieved is better than experiments 2 and 3.

The increase in users of the Wifi.id Corner internet service is not directly proportional to the service satisfaction obtained by the Wi-Fi.id Corner service. In fact, many Wifi.id Corner customers complain and still complain about the quality of Wifi.id Corner services ranging from unstable network problems, slow speeds, to problems with the location. An analysis is needed to find out these problems. The purpose of this study is to assess the level of customer satisfaction with service quality and determine the priority attributes in improving service Wi-Fi.id Corner. The method used in this research is Service Quality (SERVQUAL) and Six Sigma. From the research results, it is found that the services provided by PT X have not fulfilled the wishes of its customers optimally, this can be shown by the high gap value and low sigma value. The following are three attributes that are an important concern for the company because they have the lowest sigma value: environmental cleanliness Wifi.id Corner with gap and sigma values of -1.30 and 1.88, internet speed stability R2 with gap and sigma values Of -1, 27 and 1.85, it is rare for interference in accessing the internet R4 with gap and sigma values of -1.23 and 1.85.