Everyone has the service provider they deserve? Right or wrong?

You know how it is! A big project, a few details, no Rocket Science, and yet something goes wrong here and there. What do you do? Do you question yourself or your service providers? What do you expect from a service provider? Or from the other perspective: What does the service provider expect from you? In a short outline, we work together on the A-B-C analysis of your customers. Do you have the right external partners on board for this? What are the qualitative and quantitative factors for choosing a service provider? Because at the end of a project, your customer's gaze falls on you, not on your service providers.