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This paper presents the quality factors of web services with definition, classification, and sub-factors for business and service level measurement. Web services, main enabler for SOA, usually have characteristics distinguished from general stand-alone software. They are provided in different ownership domain by network. They can also adopt various binding mechanism and be loosely-coupled, platform independent, and use standard protocols. As a result, a web service system requires its own quality factors unlike installation-based software. For instance, as the quality of web services can be altered in real-time according to the change of the service provider, considering real-time property of web services is very meaningful in describing the web services quality. This paper establishes the QoS metrics for service level measurement and focuses especially to the two quality factors: business value and service level measurement, affecting real world business activities and a service performance.