The supplier/product group pairings are split into four categories according to the level of interdependence with the Group: pp category A – Unavoidable relationship: the Group relies heavily on the supplier for this product group; pp category B – Collaborative relationship: Groupe PSA and its supplier rely heavily on each other for this product group; pp category C – Dependent relationship: the supplier relies heavily on the Group for this product group; pp category D – Competitive relationship: the Group does not rely on the supplier (there are many other suppliers for the purchase group in question) and the supplier does not depend on the Group for this product group.