One of the overarching benefits for clients from combining design, construction and hard and soft services under one contract is that there is a single point of contact for all aspects of the service:
"It's much more straightforward, and there are fewer hurdles to jump if you want to get something done… Government only has to go to one body for any defective services."
The first advantages of a single point of contact come in the form of ease, time and efficiency of management - 'management can spend time managing'. However there are other benefits: with all the services under one lead they are easier to control and performance is more visible. And fewer resources are expended dealing with disagreements or bureaucracy.