This Practice Note deals with the tort of misfeasance and the ingredients of the tort, where the tortfeasor is a public officer, the requirement for the tortfeasor to have exercised power as a public officer at the time of the relevant action and to have acted (or failed to act) in bad faith, the requirement for the public officer to have known at the time that the act would probably harm somebody, causation, the requirement for damage and vicarious liability.