The Bibik Sayur application is an application-based online grocery shopping owned by Palembang people, who are already very familiar with telecommunications technology. One of them is by using this application, it invites people to shop from home with quality goods and low prices. Moreover, in the midst of the spread of Covid-19, they have to face the crowd to find the quality goods they want. The problem that exists in this research is that the Bibik Sayur Application does not yet know the extent of the community's level of utility in using the Bibik Sayur Application service. From these problems, the Bibik Sayur application needs to be evaluated using usability testing which is a process where the software is tested to see how useful it is for the user, and if the user or user is satisfied with the software, it can be concluded that the application can be used properly. To measure usability testing on the Bibik Sayur Application, there are five usability aspects used, namely Learnability (easy to learn), Efficiency (efficiency), Memorability (easy to remember), Errors (error and security) and Satisfaction (satisfaction). The results showed the measurement of usability testing in all aspects, the score obtained was 84%. Based on the feasibility measurement scale, the value between the scale of 81-100 means that the Bibik Sayur Android application is very suitable for use by the people of the Sako sub-district, Sialang village.

Medical Chek Up (MCU) or Periodic health checks are part of occupational health services that are the right of every worker and as part of preventing health risks to all workers and to reduce the risk of sudden death due to illness in the workplace, it is necessary to carry out annual periodic health checks as a worker obligation that must be carried out once a year. The purpose of this study was to design the User Interface (UI) of the Medical Check-Up Mobile application  to make it easier for workers to find out the results of their examinations and doctors can evaluate the health status of workers. The object of this study was carried out at the Pratama Clinic of PT. Pertamina Patra Niaga Sub Holding Marketing Region Sumbagsel. The research method in this study is a descriptive method that is usually used to solve problems, by describing and describing the classified data. While the design method used is Design Thinking. The results of  the User Interface design  can later be used as a proposal to the Pratama Clinic of PT Pertamina Patra Niaga Subholding Marketing Sumbagsel Region for further implementation by the Internal IT Team.

Games can be used as educational tools, helping students learn about a particular subject or concept. Just like playing learning educational games for Early Childhood Education (PAUD), it can be a way to learn. In learning activities such as letters, numbers, colors, names of animals, plants, and so on, they still use conventional learning media, so they are less effective in implementing learning, where currently children interact more with smartphones than books, this can This causes parents whose children are still in elementary school, such as reading, counting, writing using books that are less attractive, which can cause children to be lazy to study, and less attractive to children in learning. From that problem, the author is interested in making educational game applications by utilizing smartphone media. And the application of this learning educational game was made by utilizing the Fisher Yates Shuffle Algorithm, by randomizing the questions in this application. Based on the test results, the implementation of the Fisher Yates Shuffle Algorithm for question randomization in the early childhood education learning educational game application (PAUD) went well, was in demand by PAUD children and there were no repeated questions that made PAUD children happier in study.

PT. Pertamina Geothermal Energy Area Lumut Balai has a very extreme work location with various contours, safety factors and lack of access to electricity for street lighting are things that need attention given the importance of street lighting in the company's operations. Street lighting is an important element that supports the comfort and safety of road users in their activities at night. The research objective is to design an IoT (Internet Of Things) system that can monitor the utilization of pipe heat into electrical energy for street lighting and provide street lighting needs around geothermal well pipes. In this study used thermoelectric as a tool to generate electrical energy from available heat. The IoT system is used to read data parameters as a tool to display temperature, voltage and current values on the LCD (Liquid Crystal Display) and the Thingspeak website. The temperature value is read by the MAX6675 thermocouple sensor while the INA219 sensor is used to read the voltage and current values. The focus of this research is to heat the thermoelectric so that it can produce electrical energy to turn on the lights as lighting and can monitor parameter data directly. The highest thermoelectric electrical energy output is at a temperature of 75.1˚C. Where at this temperature a voltage of 2.32 V is generated and a current of 0.03 A. The lamp will turn on if the thermoelectric heat is fulfilled. The light turns on when the environment is dark and the light turns off when the environment is bright