Vendor coordination is the unglamorous work of making sure somebody is dealing with each supplier and that two people are not dealing with the same one differently. It is rarely a scheduling problem and almost always an ownership problem: the tasks are obvious, but nobody can say whose they are, so they happen twice or not at all. The fix is boring and it works.
One named owner per supplier, including the boring ones
Every supplier needs a person who would notice if it stopped answering. Not a department, a person. The suppliers that go wrong are almost never the ones with an obvious owner; they are the utility, the software renewal and the annual service contract that everybody assumed somebody else was watching. Assigning them takes an afternoon and prevents most of the surprises.
Put the dates where the owner will meet them
Coordination fails when the information and the person are in different places. A renewal date in a contract in a shared drive coordinates nothing. The same date against the vendor, alerting its owner before the notice window opens, is the entire mechanism. Everything else in vendor coordination is a consequence of getting that one thing right.
Write down who chases documents
Insurance certificates, updated bank details and renewed agreements all need chasing, and the chasing is what silently does not happen. Either the relationship owner does it or one person does it for everybody; both work, and the failure mode is assuming it is obvious. A supplier portal removes most of the chasing by letting the supplier upload its own renewals.
Questions people ask about vendor coordination
Should one person own all vendor relationships?
In a very small business, yes, and it is simpler. Past about thirty suppliers the single owner becomes the bottleneck and the better model is a named owner per supplier with one person owning the record itself.
How do we stop two people buying from different suppliers for the same thing?
A category on every vendor row. Duplication is invisible in a list of company names and obvious in a list sorted by category, which is also how consolidation opportunities surface.
What is the minimum coordination a small business needs?
An owner on every supplier, a renewal calendar with notice dates, and one person who reconciles the payee ledger against the vendor list once a year. Everything beyond that is refinement.