Transition to External Sourcing Model The success of the outsourcing initiative depends heavily on the implementation effort beginning with the contract execution to the transfer of the agreed-upon activities and resources. The buying and selling organizations must follow the specific roles outlined in the contract. The buying organization also must appoint a relationship manager. The relationship manager and the suppliers must merge their independent plans into one consensus plan. The consensus transition plan must include, at a minimum, the following: Benton, W. C.. Purchasing and Supply Chain Management (p. 209). SAGE Publications. Kindle Edition