A key concept in the resilience model is the design scope, defining the states and events supported by the design. This definition enables to formalize the different treatment of normal situations ( routine, latent hazard and under hazard ) vs. unpredictable situations.

The guide assumes that there is no practical way to specify the system behavior for all possible situations and events. Therefore, we need to restrict our design to specific expected states and events, comprising the design scopes.

  The design scope consists of the expected states ( both routine and exceptional states), and events expected in these states.

  States or events not included in the design scope ( unexpected states) are the risky, because the system behavior is not defined for these state and events.

  Within the design scope, the system behavior should be defined precisely, and completely.

Updated on 28 Dec 2016.