• For the most collaborating relationships (in other words, externally integrated relationships), there is a higher correlation between Logistics-Production and external integration than between Logistics-Marketing and external integration. Also, a cluster analysis showed that there was not any externally integrated relationship in a company
not integrated in the Logistics-Production interface. However, this cluster analysis showed that there were externally integrated relationships in companies not integrated in the Logistics-Marketing interface. This shows that to achieve external integration companies need to be integrated in the Logistics-Production interface, while, interestingly, the integration between Logistics and Marketing is not a prerequisite.