From Open Risk Manual


Availability. Property of being accessible and usable on demand by an authorised entity. It is a metric which measures the percentage, normally computed over a periodical basis (such as a month) and net of planned or unplanned service downtimes of service coverage.


  • In procurement finance, it is the amount of money that is available for drawing to the assignor. This would be the value of all approved receivables multiplied by the pre-agreed prepayment percentage less any amounts already paid to the assignor.
  • In the context of Business Continuity it is indicating the presence of staff or organizational resources (buildings, applications) etc. in support of business functions


  • ISO/IEC 27000:2018