Note 1 to entry: A dependable item is one where there is justified confidence that it operates as desired and satisfies agreed stakeholder expectations.

Note 2 to entry: In most cases, the term dependability is used as an umbrella term to express its core attributes of reliability, maintainability, and supportability and the resulting availability. In some cases, attributes such as resilience, recoverability, durability, integrity, safety, security, trustworthiness are included in or overlap with dependability.

Note 3 to entry: In order to express the ability to perform, requirements in terms of functions to be performed, when the performance is to be achieved, and the life profile conditions are specified by parties with interest in performance.

Note 4 to entry: The attributes of dependability can be expressed qualitatively or quantitatively.

Note 5 to entry: It is also a common practice to use the term dependability in the context of a subject of study or discipline