When you get that promotion or that new assignment it comes with people, unless you are doing something brand new, starting from zero!  Those people come with ways of working, ways of communicating, ways of thinking that they have developed over months and probably years.  There is an existing trust with each other and with the organization.  There is an existing level of commitment and accountability. And, there is an existing attention to detail and results. To some extent you are an outsider tasked with managing, leading and coaching these people.