Thus, Managed Services could represent a natural extension to their existing capabilities. However, providing Managed Services to customers brings its own set of challenges. The required capabilities, both for go-to-market and for designing service delivery, represent a significant departure from the traditional best-effort model operators typically deploy to their customers. In order to succeed in Managed Services, Telecom operators must open their internal operating models to customers. This requires seamless collaboration between commercial, technical and operational units. For many Telecoms this means an in-depth transformation of the mental model currently at work.