Is the seller able to provide the required number of supplies at a reasonable cost?
Is the product of decent quality?
Is the vendor trustworthy (will materials arrive on time)?
Is there a good reputation for the vendor?
Is it simple to work with the company?
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Q: How do you handle a difficult vendor?
A: Work on your communication.
Get everything down on paper.
Ask them what they need from you.
Initiate an escalation as soon as possible.
Evaluate if their service is actually the tool or platform you require.
Don't be afraid to pull out.