Subcontractor evaluation, selection or termination

Answer:
There is no universal formal process for dealing with subcontractor evaluation, selection or termination. Each organization has to design its own process as long as it is useful and effective.
I like to start my conversation with organizations with this drawing:

Can your organization work will all subcontractors? Does your organization have some basic requirements? For example, Subcontractors must:
Be ISO 9001 certified;
Have certain kind of machines;
Have certain kind of experienced workers;
Have a production capacity above a certain level.

After that evaluation, subcontractors that passed belong to a pool of approved subcontractors.

When your organization has a specific order that must be fulfilled, checks the pool of approved subcontractors and request quotation to two or three. As approved subcontractors they have enough quality. Now, what is relevant is knowing who ha s the best price, who is available, who can deliver on time.

Subcontractors worked for your organization. It is important, from time to time, to evaluate actual performance to check if the initial evaluation was a good predictor of performance, to find if any of the subcontractors should invest more in improving performance, and if any of the subcontractors due to bad performance is really not a good partner for your organization.

The following material will provide you information about treating subcontractors:
- ISO 9001 – How to control outsourced processes using ISO 9001 - https://advisera.com/9001academy/blog/2015/05/05/how-to-control-outsourced-processes-using-iso-9001/
- How to evaluate supplier performance according to ISO 9001:2015 - https://advisera.com/9001academy/blog/2015/10/27/how-to-evaluate-supplier-performance-according-to-iso-90012015/
- Free course – ISO 9001:2015 Lead Implementer Course - https://advisera.com/training/iso-9001-lead-implementer-course/
- book - Discover ISO 9001:2015 Through Practical Examples - https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/