The CBB recognises that BCPs involve costs, and that it may not be cost effective to have a fully developed and implemented BCP for all conceivable worst-case scenarios. However, the CBB expects licensees to plan for how they may cope with the complete destruction of buildings and surrounding infrastructure in which their key offices, installations, counterparties or service providers are located. The loss of key personnel, and a situation where back-up facilities might need to be used for an extended period of time are important factors in effective BCPs.