 Since the permit to work is the primary de-conflictation tool all work activities in high risk environments should have a permit to work, specific hazardous operations will then have a second permit for activities such as confined space or hot work.Here the hot work permit is minimising the risk of the individual task, the permit to work is minimising the risk of simultaneous incompatible activities.Permit to work systems that permit authorisation and its traceability are necessary if they are to be beneficial.