Before revision: define the following Dependability Attributes: Availability - readiness for correct service Reliability - continuity of correct service Safety - absence of catastrophic consequences on the user(s) and the environment Integrity - absence of improper system alteration Maintainability - ability for easy maintenance (repair) As these definitions suggested, only Availability and Reliability are quantifiable by direct measurements whilst others are more subjective.
After revision: define the following Dependability Attributes: Availabilitya - readiness for correct service Reliability - continuity of correct service Safety - absence of catastrophic consequences on the user(s) and the environment Integrity - absence of improper system alteration Maintainability - ability for easy maintenance (repair) As these definitions suggested, only Availability and Reliability are quantifiable by direct measurements whilst others are more subjective.