This research is based on the importance of learning realistic mathematics in mathematics. The purpose of this study is to determine the implementation of learning by using realistic mathematics learning models in improving the mathematical understanding of students of class VI MIN 2 Mataram City. PMR is a learning approach to mathematics that involves the reality and experience of students. In mathematics learning students are required to be more active in finding and finding solutions to a problem, so that learning that occurs will be centered on students. The research method used is a qualiative method for collecting data through observation, interviews and documents. The results showed that the application of realistic mathematics learning was effective in increasing students' mathematical understanding in the discovery of mathematical concepts through contextual learning and relevant to daily life. Thus, this research provides a significant involvement in understanding the role of PMR in increasing the mathematical understanding of students as well as part of an effective mathematical learning approach.

The southern district of Rejowingan in Magelang faces challenges like large dumpstores, poor water quality, floods, and rising food needs. Villagers are working with the Ormawa DPM KM PPK team to address these issues. The government launched the Climate Village Program to improve the region's climate and resilience to natural disasters. Permaculture principles can be applied to organic waste management through maggot cultivation, which reduces waste volume and supports sustainable agriculture. This combination of permaculture and maggot cultivation can be an effective and environmentally friendly model for addressing organic waste and ecosystem sustainability.

Kasindir Village is one of the villages in Jorlang Hataran District, Kabupaten Simalungun, Sumatera Utara. Kasindir Village is a village that carries out agricultural, livestock, and trade activities. Kasindir Village has great potential for developing MSMEs in the village. The development of MSMEs is considered capable of realizing a sustainable economy and supporting local governments in the Sustainable Development Goals (SDG's) program, especially in poverty and hunger eradication programs, sustainable economic growth, and employment. Community service implementers in Kasindir Village observed that MSME actors still require understanding and knowledge on utilizing information technology to advance their businesses. This includes packaging attractive products, providing the latest innovations, and promoting on social media to expand their market. MSME strategy development is able to realize the spirit of the SDGs. In this activity, the methods used to carry out community service activities are socialization and observation methods. Some of the problems faced by creative MSMEs in Kasindir Village include limited capital, raw materials, the use of very simple production equipment, and limited marketing media. Therefore, various parties, both government and private, need to provide support through sustainable business development programs.

Work accidents that occur on ships often occur in various cases, one of which is a work accident that occurs in an enclosed space. This is often experienced by a crew member who is unable to understand the proper methods and procedures for working in an enclosed space. Against this background, the researcher conducted a risk assessment of personal safety when working in an enclosed space to find out the causes, impacts and controls of the crew members' lack of understanding and knowledge of personal safety when working in an enclosed space. In this descriptive study using the Job Safety Analysis (JSA) method and the Bowtie method, the researchers obtained very high/extreme (E) scores in carrying out work in closed spaces, namely the ship's crew inhaled poisoned air/gas while checking in the cofferdam tank where these results obtained an likelihood value of 66% and a severity value of 71%. By holding routine drills regarding the application of safety principles in an enclosed space in more detail to all Ship's Crew and at the end of the drill closing displays a training video that displays shows about various accidents that occurred in an enclosed space and the causes of these events are reviewed in detail. So with a more detailed drill on the application of safety principles regarding enclosed space material to all Ship's Crew, it is hoped that it can minimize the occurrence of work accidents in an enclosed space.