Gamerground is a computer shop engaged in the sale of laptops, computers, spare parts, accessories supporting and providing repair services. The marketing process is less than optimal because it only sells by phone or social media. There are some problems that occur between them : 1. Stock management is not optimal because of frequent discrepancies between stock records with the amount of goods available so often consumers feel disappointed with the services provided, 2. The issue of uploaded ad duration in uploaded social media will alternate from one product content display to another in a relatively short period of time, 3. The absence of management of consumer sales transactions thus requiring recording of repeated transactions, 4. The decline in sales turnover in recent months, 5. The management of customer or consumer data is less noticed. Based on these problems, this study aims to design a web-based online sales information system mobile on gamerground. This research uses the development of SDLC waterfall model system which consists of planning, analysis, design, implementation and maintenance. Using PHP and MySQL Server programming language as database. The results of research in the form of Online Sales Information System Web-Based Mobile that can facilitate consumers to view products, make reservations for consumers and management for the admin. This information system is equipped with product management features, order data management, customer data management, preparing order reports and payment confirmation. So that this information system can provide convenience both consumer and admin on gamerground.

Based on the results of observation, the learning method used in SMP Muhammadiyah 3 Kaliwungu is in the form of discourse, discussions, question and answer with the book media. Learning methods that have been applied so far have not had enough impact on students' level of understanding. The method used is less successful, so students feel bored and bored. This study offers a solution for multimedia utilization with the Mind Map method as an interesting learning media, where computers can display text, images, videos and audio so that students can have a pleasant impression in the learning process. The validity value of media experts is 2.9 which is declared feasible, while the validity value of material experts is 3.3, which is declared feasible, and increases students' understanding and interest as users from 58.5% up to 80.5%.

Abstrak A inventory system is created to maximize customer service and corporate profits, the system created by focusing on stockopname security. The method of rule base and safety stock, used to optimize inventory in warehouse / data warehouse. After the trial, the result rule / rule proven, so the stock in a secure position.