One of the most significant changes was the introduction of a political dimension to EU-ACP development cooperation. This aspect of Cotonou has been subject to some of its fiercest discussion and criticism because it linked development cooperation to conditionality. Respect for human rights, democracy and the rule of law have become so-called "essential elements" the violation of which can lead to partial or total suspension of development aid. Conditionality is one of the issues which have been considered to be undermining the principle of equal partnership on which Lomé was based.