This book provides a hugely important contribution to a complex and vital area of international criminal law. For the courts and tribunals which are charged with the responsibility of trying the most serious cases in the criminal calendar, there can be few subjects of greater concern than the approach that should be taken when dealing with the alleged responsibility of those who are seemingly ‘in control’ when the worst international crimes are committed. The author, who brings to bear his distinguished academic and practical experience in this area, has subjected the issue to painstaking research and, in the event, he has provided with his personal views a penetrating.