As was recently commented on horses for sources about the three tenets of the global business services execution:

"»      Focusing on the Customer – Global Business Services’ processes and technologies enable business unit strategies.  Building alignment and sharing a vision is imperative to achieving successful results.

»      Building the Service Delivery Model – Achieving economies of scale and scope requires well-defined and common business architecture.  Effective organizations have a strategy to construct and leverage their global business service capabilities.

»      Aligning Processes and Technology – Providing best practice back office services requires vision, agility, and coordination across multiple functions.  It requires a focus on the provision of solutions, not technology".

I would also add people/vendors as a fourth tenet. In most global business services it is paramount to align people/vendors to ensure execution on process/technology is done well by all parties involved.