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Formalised listing of actions to be performed in a given work setting to ensure that, no mater how often performed by a given practitioner, no step will be forgotten. An analogy is often made to flight preparation in aviation, as pilots and air-traffic controllers follow pre-take-off checklists regardless of how many times they have carried out the tasks involved. Checklists are an example of positive reporting on safety critical tasks, in other words the affirmation of the safe status of equipment. In contrast a system of negative reporting assumes that all equipment is in a safe state unless explicit warning that it is not- a potential flaw in the system for closing bow doors in the Herald of Free Enterprise sinking.