Definition of Availability
System Availability is whether (or how often) a system is available for use by its intended users. Since downtime (the opposite of availability) is usually very costly, this is an integral component of Security.
Is your help desk slammed by password reset calls?
Read more about Password Manager.
Still waiting for a new account?
Does it take too long to provision new users with accounts? Are your systems cluttered with orphan accounts?
Read more about Identity Manager.