Règle correspondante
Netherlands
Practice Relating to Rule 14. Proportionality in Attack
Section C. Information required for judging proportionality in attack
The Military Manual (2005) of the Netherlands states:
0511. The circumstances of the time are decisive to whether an object constitutes a military objective. The definition leaves the necessary discretion to the commanding officer. The Dutch Government, in ratifying AP I [1977 Additional Protocol I], has declared in this connection that military commanders who are responsible for carrying out attacks must base their decisions on their evaluation of the information available to them at the time …
0543. When not to attack
An attack should not proceed when an obvious lack of proportion appears to exist between the expected military advantage and the expected collateral damage. The decisive factor is whether a normally alert attacker, in receipt of and acting on due information, could have expected the excessive damage among the civilian population and civilian objects. 
Netherlands, Humanitair Oorlogsrecht: Handleiding, Voorschift No. 27-412, Koninklijke Landmacht, Militair Juridische Dienst, 2005, §§ 0511 and 0543.
At the CDDH, the Netherlands stated:
Commanders and others responsible for planning, deciding upon or executing attacks necessarily had to reach decisions on the basis of their assessment of the information from all sources which was available to them at the relevant time. 
Netherlands, Statement at the CDDH, Official Records, Vol. VI, CDDH/SR.42, 27 May 1977, p. 205, § 1.
Upon ratification of the 1977 Additional Protocol I, the Netherlands declared with regard to Articles 51 to 58 inclusive:
It is the understanding of the Government of the Kingdom of the Netherlands 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 available to them at the relevant time. 
Netherlands, Declarations made upon ratification of the 1977 Additional Protocol I, 26 June 1987, § 6.