When considering the supply chain function of:

Plan

Source

Make

Deliver

Enable

it makes sense that:

When considering the supply chain function of:

Plan

Source

Make

Deliver

Enable

it makes sense that:

Make is by far the most outsourced as seen through the movement toward global outsourcing and the move in the US to a service economy

To be successful, none of these can be outsourced

Deliver is outsourced the most because others are likely to have a greater core capability in this area and it doesn't affect our competiveness

Plan is likely to be the most outsourced because it doesn't directly affect our use of internal resources