In order to manage and control quality of the products in a real-time manner, statistical process control methodology, one of the most popular quality control activities, is utilized as a software service in many manufacturing industries. However, these quality control systems are not affordable to small and medium sized industries due to their expense in installation and difficulty in the systems. To reduce installation cost and difficulty of the systems, this research paper suggests web-based statistical process control system with user-centered design. Although number of non-traditional and web-based SPC systems exists, they tend to focus their designs to either beginners or experts of SPC system. The suggested system, PAS, aims to develop the system to be compatible with frequently used browsers and acceptable in both beginners and experts. Lastly, it accepts diverse forms of data so that it attempts to support data from industry to be used directly to the system.