Implementation of Expert System Diagnosis of motorcycle engine damage is a solution of motorcycle service at AHASS 00955 Mitra Perdana, Expert System is a system that is related to the knowledge possessed by experts and technology users to solve a problem. This article, discusses the design of decision-making applications that have an important role in the process of diagnosing motor engine damage. Because the system is currently running the user only hands over the motorcycle to the technician. The use of computer-based artificial intelligence can be a solution to problems in structured decision making. The design of this expert system is designed using the forward tracking inference method and is designed in the form of a website to facilitate users in using it.

This research is a quantitative descriptive study. The research sample were 58 students at SMPN-1 Mentaya Hilir Utara, Kotawaringin Timur Regency. The learning management instrument used an assessment questionnaire for planning, organizing, implementing, and evaluating learning which was assessed by 4 observers. learning outcomes were analyzed using classical assumption tests consisting of normality tests and homogeneity tests, as well as hypothesis testing using the Paired sample T test and Independent sample T test. The results of the study found that the management of online learning based on whatsApp social media was carried out "good" and the learning motivation of students was in the "medium" category. Online learning based on whatsApp social media has a significant effect on improving the learning outcomes of students' digestive system material, so it can be recommended as an alternative learning model during a pandemic.

Science and Technology can be utilized in improving performance in an organization or company. During the COVID 19 Pandemic, BAZNAS Kabupaten Tangerang was encouraged to create a media as a facility for philanthropists in delivering zakat and infaknya, due to many limitations to be done directly as before.  An application to receive and distribute zakat through android-based devices in the palm of the hand is the solution of the problem that can help BAZNAS Kabupaten Tangerang to be able to continue carrying out its activities.  The result of this research is designing and building android-based applications in BAZNAS kabupaten Tangerang that are expected to be able to serve the community, store and share information to the community. Supported by articles, news, information documents, and discussion forums as a forum to increase trust and foster religious and religious values in the community.

Industrial growth is characterized by the ability to progress in the field of production both in the type of industry, increasing the quality and volume of production activities. Machine is one of the factors of production which determines the smoothness of a production process. In order for the production process to run efficiently, a certain part of the company that is needed to support the maintenance and repair of the machine is called Maintenance Engineering. PT. Segwerk Ind is a multinational company engaged in printing inks for the packaging industry with imported raw materials such as dyes, varnish. The problem of how to maintain the condition of the machine so that it is always prime when production activities take place, Trouble machines are indeed one of the factors that can make a company go bankrupt, such as the production process is hampered, a long machine down time, so that customers will replace their suppliers because they do not want to risk business they are stunted. Therefore, for the success factor of a company's production process, it is required to have appropriate preventive and corrective maintenance activities as well as the problem of lack of competent human resources, therefore we need tools that can solve these problems. The results displayed by making expert system software show that the ink machine problem solving can be known based on the historical machine so that the downtime faced by PT. Segwerk Ind can be pressed as little as possible against machines in the ink industry such as ink printing machines.