You want to trust the people who work for you can execute their jobs with competence. You want that your customers trust you with their money. When you think about it, trust is the juice that keeps everything moving forward. The more your customers trust you, the more work they give you. The better the people around you perform in their jobs, the more you trust them.
So how do you build trust? By focusing on how your key managers communicate and coordinate work. Are managers making the requests for the specific actions they need? Are those requests attached to a due date? Do they get a clear commitment from the performer?
And lastly, does that performer get that commitment done in a way that meets the conditions of satisfaction of the requester?
Simple, not so easy, but extremely important for building trust.