Sourcing teams that optimize the benefits they obtain from implementing strong telecommunications expense and inventory management (TEIM) practices have a clear understanding of the benefits they can achieve and the level of effort and change required to achieve them. With this framework, enterprises can readily identify their greatest challenges in managing telecommunications services, and thus are able to select and contract with the most appropriate TEIM supplier. The telecommunications services landscape is very dynamic, thus enterprises' relationships with service providers must change, as can their relationships with TEIM suppliers.