Vendor Projects
The most visible and trackable results in anything project-related are the deliverables. These take the form of those "zero-length items" in your plan (MS Project and some Gantt chart tools use diamond shapes) that mean some objective has been met. Vendors might refer to them as toll gates but your project managers might opt for objectives or milestones. Bonus if you know the difference. I don't care what they're called, someone needs to keep track of them.Your vendor will understand the deliverables they're responsible for very well; any professional services type organization does this type of work over and over again. What they can't replace, however is understanding your business opportunity or challenge. Vendors can help guide you in discovering your business requirements, especially if in a new domain. But customers are still responsible for the results of their project.