As to the concept of administrative discretion, it seems impossible not to take a brief survey on the Hart and Sacks' definition of discretion, although it suffers from criticism by R.M.Dworkin on the ground of the sole-right-answer thesis, and it appears to me the improper refusing of judicial review by the argument that each of alternative courses of action is thought of as permissible. It seems also impossible to ignore Dworkin's distinction between strong and weak discretion,for his significant discussi...