OEF multi-functionality hierarchy: (1) subdivision or system expansion; (2) allocation based on a relevant underlying physical relationship (here substitution may apply); (3) allocation based on some other relationship
Affectation/hiérarchie multifonctionnelle: 1) subdivision ou extension du système; 2) affectation sur la base d’une relation physique sous-jacente (substitution applicable ici); 3) affectation sur la base d’un autre type de relation