5. Software failure rate, availability, and reliability

In recent years many product suppliers have been implementing complex software-controlled systems with a large number of software features on a short development schedule. In the telecom industry, a critical customer operational issue is on system performance, especially in terms of system outages impacting the service availability for their end users. As a result, service providers frequently ask their product suppliers for software reliability and availability measurements. In this section, we discuss the relationship between software failure rate, availability, and reliability.
