What is the difference between the qualification and assessment?

Summary

What is the difference between the qualification and assessment?

Content

What is the difference between the qualification and assessment?

We want to use Procurement Qualification module to create initiative and request some information and document to update the supplier Profile. This is for an existing suppliers. I will not use this for Supplier Registration or Qualification. Just to request income tax information, bank account information etc.

I am not sure if I need to use the Initiative with Qualification or Assessment.