In addition to these principles, Art. 35 of Additional Protocol I to the Geneva Conventions reaffirms that methods and means or warfare are not unlimited, a concept that is operationalised by art. 36, which imposes an obligation on States parties to ensure unlawful weapons are not used. Weapons review processes are the mechanism to ensure the fulfilment of this obligation during the development and acquisition of new weapons. In the case of LAWS, this implies the challenge intrinsic in the complexity of the underlying technology and the possible unpredictability of the autonomous system under changing physical and operational environments.