US Patent 9143523 Assessing threat to at least one computer network

Apparatus for assessing threat to at least one computer network in which a plurality of systems (301, 302, 303, 304, 305, . . . 30n) operate is configured to determine predicted threat activity (13), to determine expected downtime of each system in dependence upon said predicted threat activity, to determine loss (12A, 12B, 12C, 12D, 12E, . . . , 12m) for each of a plurality of operational processes (31A, 31B, 31C, 31D, 31E, . . . 31m) dependent on the downtimes of the systems, to add losses for the plurality of processes so as to obtain a combined loss (12SUM) arising from the threat activity.