This book examines the concept of individual criminal responsibility for serious violations of international law, i.e. aggression, genocide, crimes against humanity and war crimes. Such crimes are rarely committed by single individuals. Rather, international crimes generally connote a plurality of offenders, particularly in the execution of the crimes, which are often orchestrated and masterminded by individuals behind the scene of the crimes who can be termed 'intellectual perpetrators'. For a determination of individual guilt and responsibility, a fair assessment of the mutual relationships...