• Reliability: Ability of an IT component to perform at an agreed level at described conditions.
• Maintainability: The ability of an IT component to remain in, or be restored to an operational state.
• Serviceability: The ability for an external supplier to maintain the availability of component or function under a third-party contract.
• Resilience: A measure of freedom from operational failure and a method of keeping services reliable. One popular method of resilience is redundancy