====== Availability ======
[[dido:public:ra:xapend:xapend.a_glossary:start| Return to Glossary ]]


[[dido:public:ra:1.4_req:2_nonfunc:14_reliability:02_availability | See 4.2.2.2 Availability]]

===== Definition #1 =====

**Availability** is the probability that a system will work as required when required during the period of a mission. The mission could be the 18-hour span of an aircraft flight. The mission period could also be the 3 to 15-month span of a military deployment. Availability includes non-operational periods associated with reliability, maintenance, and logistics. 

Source: [[https://en.wikipedia.org/wiki/Availability_(system) | Availability ]]

===== Definition #2 =====

Availability means information should be consistently and readily accessible for authorized parties. This involves properly maintaining [[dido:public:ra:xapend:xapend.a_glossary:h:hardware]] and technical infrastructure and systems that hold and display the information.

Source: [[https://whatis.techtarget.com/definition/Confidentiality-integrity-and-availability-CIA]]