It's called "negotiating". In business we do it every day.
That I believe is one of the major stumbling blocks of any Government is that an MP is often put into a role or given a Portfolio and is a totally useless negotiator and comes out with less than they went in with...
I am sure Julie Bishop is a good at negotiating a deal...the only reservation with a female in a role of an International Diplomat is how some country's view women.