Norma relacionada
Canada
Practice Relating to Rule 17. Choice of Means and Methods of Warfare
Canada’s LOAC Manual (1999) states: “Commanders, planners and staff officers have … to take all feasible precautions in the choice of means and methods of attack to avoid, and in any event to minimize, collateral civilian damage.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-3, § 24(b).
Canada’s LOAC Manual (2001) states in its chapter on targeting:
1. Under the LOAC commanders, planners and staff officers have the following obligations:
b. to take all feasible precautions in the choice of means and methods of attack to avoid, and in any event to minimize, collateral civilian damage. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 417.1.b.
Canada’s Use of Force Manual (2008), in a section entitled “Principles and rules governing the use of force that directly relates to the conduct of armed conflict”, states:
Proportionality. Planners and commanders must refrain from launching an attack which may be expected to cause incidental loss of civilian life, injury to civilians, damage to civilians, damage to civilian objects, or a combination thereof, which would be excessive in relation to the concrete and direct military advantage anticipated. All feasible precautions must be taken in the choice of means and methods of attack to avoid, and in any event to minimize, incidental civilian loss and damage (i.e., collateral damage). 
Canada, Use of Force for CF Operations, Canadian Forces Joint Publication, Chief of the Defence Staff, B-GJ-005-501/FP-001, August 2008, § 112.4.