What norms apply to the determination of lawful targets? What persons and objects may be lawfully targeted in armed conflict? What are the reasons, both legal and extra-legal, of civilian losses? What principles must be observed when attacking military objectives? How can the protection of persons who are not participating in hostilities can be strengthened? Is it possible to develop a consistent approach to targeting in armed conflict regardless of the legal qualification of the armed conflict? This monograph answers these questions and many more. Taking into account both military objectives and civilian objects, it considers the extent of their protection in a range of contexts, providing an essential source of reference for scholars dealing with issues across international humanitarian law and armed conflict.