Every partnership we run follows the same three steps. The steps are simple on purpose; their value is in doing each one properly.
Partnerships change as projects change. We schedule periodic reviews, typically at natural project milestones, to look at what is working, what is not and what should be adjusted. Small corrections early are far easier than repairs later.
If a partnership ends, whether at the close of a project or for other reasons, we hand over documentation, close out open items and make sure the customer experiences no disruption. How a partnership ends says a great deal about how it was run.