Effectively two models exist for managing outsourcing relationships, whether it’s for IT and infrastructure services or for BPO. The services industry has been pushing a managed services environment as the best practice. But in reality, this is not the best practice for all types of outsourcing.
Source: Deciding between active and passive management of outsourcing services | CIO
The top 10 IT outsourcing service providers of the year | CIO
Top 10 IT service providers of the year Accenture TCS Cognizant Wipro HCL Capgemini IBM Infosys