Related Rule
New Zealand
Practice Relating to Rule 14. Proportionality in Attack
Section C. Information required for judging proportionality in attack
Upon ratification of the 1977 Additional Protocol I, New Zealand stated:
In relation to Article 51 to 58 inclusive, it the understanding of the Government of New Zealand that military commanders and others responsible for planning, deciding upon, or executing attacks necessarily have to reach decisions on the basis of their assessment of the information from all sources which is reasonably available to them at the relevant time. 
New Zealand, Declarations made upon ratification of the 1977 Additional Protocol I, 8 February 1988, § 2.