Quality evaluation of network services by client observation

One of the major issues in the Internet is the quality control for network system usability. To improve network system quality of service, system administrators should evaluate how their systems are working, and should operate their systems to perform users´ requests and optimize performance. To manage network system performance, it is important for administrators to be aware of system usability factors such as access delay, processing time and data transfer throughput. Several ways to measure network performance have been developed. However, performance management is still difficult because of the lack of effective tools to evaluate network system usability. The goal of our work is to develop a new quality evaluation system for network system usability. In our approach, we measure system usability and performance through mechanisms installed in the clients. The purpose of our system is to make clear the behavior of the client applications, and allows us to measure system performance for system usability. We describe the fundamental concept for client observation and its performance indices, and the design and implementation of the performance evaluation system through observation. Also, we confirm the effectiveness of our system through experiments