What is co-source and what are the benefits of cosourcing?

What is co-source and what are the benefits of cosourcing?
Co-source is a synonym of co-sourcing.
Co-sourcing benefits are similar to outsourcing: both allows companies to increase efficiency, improve company flexibility and certainly enable a companies to focus more on their core competence areas. Also allows companies to save money that would otherwise be spent on more equipment, employees, benefits, payroll taxes, etc.
Co-sourcing, in addition, is directed toward business performance it means that co-sourced activities becomes a controlled and integrated part of your organization.
Other co-sourcing benefits:
customer involvement in hiring, resource allocation and execution;dedicated team under customers direct control and direction;team members gain a sense of ownership and are accountable for successes as well as failures.