Russell, Stephen, Victoria Yoon, and Guisseppi Forgionne. "Cloud-based decision support systems and availability context: the probability of successful decision outcomes" Information Systems and eBusiness Management 8:3 (June 2010), p.189-205.
Existing Citations
availability (p.191): Many people confuse or interchange the concepts of system reliability and availability. These concepts are most frequently discussed in a hardware or equipment context, but also have applicability to software. Most often associated with component or system failure, reliability is a measure of the likelihood that a system or process will perform its designed function for a specified period of time. Availability is a relative measure of the extent that a system can perform its designed function (Bhagwan et al. 2003). As a relative measure, availability includes metrics such as delays, congestion, and loading. (†1491)
availability (p.194): Typically the availability of components, software, and systems is given in terms of its likelihood of being available; not the inverse (the likelihood it is not available). In reliability practice there is a concept called five nines that refers to uptime (availability). If a system is said to have five nines reliability, it is operational 99.999% of the time. This likelihood translates to being inoperable 31.5 s per year. (†1492)
reliability (internet) (p. 191): Many people confuse or interchange the concepts of system reliability and availability. These concepts are most frequently discussed in a hardware or equipment context, but also have applicability to software. Most often associated with component or system failure, reliability is a measure of the likelihood that a system or process will perform its designed function for a specified period of time. Availability is a relative measure of the extent that a system can perform its designed function (Bhagwan et al. 2003). As a relative measure, availability includes metrics such as delays, congestion, and loading. (†1703)
