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This research extends the previous work of Tsaqila, Winiarti, and Widaningrum (2024), who applied the Complex Proportional Assessment (COPRAS) method within a decision support system for supermarket branch location selection. Unlike the prior study, which focused on Ponorogo through a web-based framework, this study expands the implementation of COPRAS to the Medan Area, Medan Kota, Medan Polonia, dan Medan Maimun districts, adapting it to local urban, social, and economic characteristics. The main objective is to identify the most strategic site for a new supermarket by analyzing multiple criteria, including land cost, population density, accessibility, safety, cleanliness, and disaster risk. Data were collected from both field surveys and official government publications. The findings reveal that the COPRAS method provides reliable and objective assessments among the evaluated alternatives, with Medan Area emerging as the most suitable location for supermarket development. Overall, this study broadens the practical scope of the COPRAS method in a different regional context and reinforces its reliability and adaptability as a multi-criteria decision-making tool in the modern retail industry.

The large number of needs for shipping goods at this time results in freight forwarding service companies having to continue to grow and compete to win the market. Online shop users will also be very confused and have difficulty in choosing a goods delivery service so they consider other factors in choosing a goods delivery service. Starting from prices, ratings, delivery time to the number of branches, online shop users are confused about choosing the best delivery service according to user needs, therefore complete data and an assessment method are needed to find out which delivery service suits the user's wishes. This study aims to develop a decision support system for selecting the best delivery service using AHP-COPRAS with the criteria of price, rating, delivery time and number of branches. the branch will make the delivery service the best choice, this is because the price and rating criteria have the highest weight. On the other hand, shipping services with high prices, small ratings and few branches will be the lowest choice in the ranking list.

Plywood is a processed product of several veneer sheets glued together perpendicularly. Plywood can be processed into various kinds of furniture, such as tables, chairs and so on. For furniture companies, plywood is one of the basic materials needed in the production process. Therefore, the company needs a plywood supplier that fits the company's criteria. The number of criteria in the selection of suppliers aims for the company to get optimal results. The following are the criteria that will be used in the study including price, material, thickness, grade and type. The biggest problem that ever happened to the company and resulted in a sizeable loss was that the supplier changed the raw materials used in the production process without the company's approval. In this study an application was designed that could assist in rating plywood suppliers using the AHP method and then using the COPRAS method. The supplier that gets the highest score after being processed using the AHP and COPRAS methods is the best supplier of plywood. Application designed in the form of a website. With this application, it can make it easier for users to choose plywood suppliers.

In this study, a ranking of the handling of Covid-19 in Asian countries was carried out using the AHP-COPRAS hybrid method. The ranking process uses the COPRAS (Complex Proportional Assessment) method, while the determination of the weight value uses subjective weighting but the criteria weights through a validation process using pairwise comparison which is part of the AHP (Analytical Hierarchy Process) method. The ranking process uses six assessment criteria: test per population, to positive per test, positive per population, healed per positive, died per positive, active per positive. The final result of the ranking shows that countries with high death cases and low cure cases will make the country's ranking fall, because cases of death and healing cases have the highest weight in their role in forming utility values.

Computer mining rigs are specially designed for only one purpose which is to mine crypto assets efficiently and effectively. Mining takes a lot of time, therefore it is very important to pay attention to computers for mining. The better the quality of the PC or computer, the faster the mining process will be. So far, consumers in choosing a mining rig computer only observe the mining rig computer without looking at special criteria such as price, motherboard, processor, VGA, power supply and RAM. COPRAS method assessment criteria include price criteria, motherboard, processor, VGA, power supply and RAM.. The system development method uses a prototype, the system design uses UML and the system manufacture uses PHP and MySQL. The results of the computer mining rig recommendations calculated using the COPRAS method are 12 GPUs 381 mh/s with a value of Ui = 1,000, Rig RTX 2060 with a value of Ui = 0,8157, Rig 6 x RTX 3060 with a value of Ui = 0,7108 and Rig RTX 2060 II with a value of Ui = 0.7014..

Interest in buying a motorcycle is certainly caused by various criteria, from the criteria of brand, model, type, price, engine capacity, transmission, braking, year of manufacture and fuel consumption. Of the many criteria, of course, makes buyers get a variety of choices according to their wishes. However, in practice, there are difficulties in determining the criteria in the selection of motorcycles because many consumers do not understand the criteria for motorcycles. The weight of the assessment criteria for the COPRAS method for choosing motorcycles are namely price criteria weighing 40%, fuel consumption weighing 30%, engine capacity weighing 20% ​​and year of manufacture weighing 20%. The recommendation results from the selection of criteria for the Honda brand, type of scooter, automatic transmission and single disc braking, the recommendation results obtained are Beat Street with a value of 1,000, Genio with a value of 0.995, Scoopy with a value of 0.929, Vario 150 with a value of 0.866, PCX with a value of 0.812 and ADV with a value of value 0.796.