It can therefore be concluded that efficiency relates to the utilization of resources in a
value creating processes, which lies at the interface between contractor and supplier in
the context of this paper. Since the transformation in this case is a joint process between
the contractor and supplier, sacrifices have to be made by both parties who have their
own ambitions and goals to fulfil. Achieving an efficient contractor-supplier relation
would imply: cutting costs and reducing lead times through reciprocal involvement by
contractor and supplier in the interface-related value creating processes.