It is important to keep track of your vendor’s performance. If you realize that they are continuously shipping orders late, sending incomplete or incorrect orders, or sending low-quality products, communicate your concerns to the vendor. If it is something you do not think is improving, you may need to end your contract with your vendor.
No matter how detailed your vendor selection process is, you can never know if a vendor will follow through on their promises. The only way to know for sure is to take a chance on them.