Purchasing process (Clause - 7.4.1)
This clause is about establishing purchasing process.

Develop procedures to control product purchases.
Develop supplier evaluation and selection criteria.
Develop supplier monitoring and re-evaluation plans.
Monitor the performance of company's suppliers.
Act whenever suppliers fail to meet purchasing requirements.
Develop supplier evaluation, selection, and monitoring records.

Purchasing information (Clause - 7.4.2)
This clause is about clarifying purchasing information, it offers three requirements:

Plan organization's product purchases.
Review purchase requirements before sharing them.
Maintain organization's purchasing documents and records.

Verification of purchased product (Clause - 7.4.3)
This clause is about verification of purchased products.
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