Management Insource Vs Outsource,

Valid, useful, used and current(2015-2018) references needed on page single space with 5 references.

What are some of the other benefits or advantages of having to work with many vendors versus one vendor?

Think about risk management, what might be some of the risks associated with either one of the choices? 

From planning prospectives, if you were to write a mitigation plan how do you address it?