Règle correspondante
Practice Relating to Rule 14. Proportionality in Attack
The Report on the Practice of Botswana recalls that Article 51(5)(b) of the 1977 Additional Protocol I provides for the principle of proportionality, but it argues that its essence is not well defined because there are no clear criteria concerning the distinction between indiscriminate and disproportionate attacks. 
Report on the Practice of Botswana, 1998, Chapter 1.5.