C'est sur ces considérations que se base l'amendement qui ne lie pas l'obligation de lien entre la conception et l'exécution mais rend obligatoire sa justification si ce lien est utilisé. Cet amendement définit clairement ce qui est entendu par conception préliminaire, définitive et exécutive.
These considerations are the basis both for the amendment which makes it possible to award contracts for the design and execution of works either separately or together but requires justification to be produced where mixed contracts are awarded, and for the amendment which clearly defines what is meant by preliminary project paper, final project paper and executive project paper.