DEFINITION:

Reliability: ‘A system performs as it is intended.’ System reliability is a measure of the degree to which a system performs as it was designed to do, as opposed to doing something else (like producing a wrong answer or providing no answer). Definitions of reliability will therefore vary according to the definition of what
the system is supposed to do. In general, if a system is in an unreliable state then it is ‘unavailable’ for its intended work tasks.
Scale: Mean time for a defined system to experience defined failure type under defined conditions.

(Source: ACARE Domain 611)

SUBDOMAINS:

1. Means of compliance: Fault tolerance
2. Reliability: Analysis, Requirements
3. Deterministic: Functionality, Resources bound, Time bound
4. Maturity
5. Recoverability