1. A method of monitoring an entity within a process plant comprising: collecting entity status data pertaining to the status of an entity within the process plant while the entity is in operation; collecting criticality data pertaining to the importance of the entity within the process plant, wherein the criticality data comprises a quantification of a failure defense planning evaluation of the importance of the entity as the entity affects other entities and/or operations within the process plant; collecting corrective measures data pertaining to a corrective measure associated with the entity within the process plant; receiving the entity status data, the criticality data and the corrective measures data at a computer system; causing the received entity status data and the received criticality data to be concurrently available to perform a further computer implemented function comprising modifying the corrective measure associated with the entity; and using two or more of the received entity status data, the received criticality data and the received corrective measures data to perform the further function within the process plant.