Availability
! Sometimes known by its opposite -> Denial of Service
! Applied both to data and to services
! A data item, service or system is available if
! There is a timely response to our request
! Resources are allocates fairly (no requester is favored over
others)
! The service or system involved follows a philosophy of fault
tolerance.
! HW or SW fault
! The service or system can be used easily and in the way it
was intended to be used.