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In this study a web-based expert system was designed using the Naïve bayes method which was intended to help farmers diagnose chili plants. The system development method used is extreme programming which consists of planning, design, coding, testing. A web-based chilli plant disease diagnostic expert system was developed using the PHP and MySQL programming languages. This expert system is capable of diagnosing chili plants by submitting disease symptoms at the time of inspection. Based on the selected symptoms, this system will provide diagnostic results and then display the disease and solutions for the chili plant disease. The results in this study concluded that there was compatibility between the results of the expert system diagnosis using the Naïve bayes method with experts.

PG were still using a manual system, especially the administration section which is handling information process that was not regulated in a good information base system, namely data processing.Procurement of heavy equipment which takes quite a long time from manual recording, preparation of reports, to searching for meaningful data on the company's heavy equipment, and can also assist the administration in searching for information contained in the procurement of heavy equipment. To overcome this problem, a program was created that could assist administration staff in managing data on heavy equipment procurement, speed up data collection on heavy equipment procurement, make it easier for administration to store data, assist in knowing financial income and expenditure transactions, help speed up data search and creation, reports and others. With the protoyping model (life cycle using prototyping) for the programming languages ​​used are PHP and MySQL. The result is to make it easier for CV. PG in the process of procuring heavy equipment data, and can also help the administration in searching for data that is in the procurement of heavy equipment.

Technology is a means of information which is very important for a company. information is expected to facilitate work to achieve goals optimal. With the increasing popularity of the internet, many business fields, especially those held large already provides online services. An example is a car rental business with take advantage of website services that contain information and the order is expected to be promotional media and will expedite the process booking. The research method used in build a car rental booking application with PHP and MySQL based website service is by analyzing needs, system design, database design, and design dialog screen.