ISO 20400 is Sustainable Procurement. This is from p. 51 of the study guide- as well as learning what the ISO numbers are, do also learn the key areas of each ISO as these come up in the exam.
I'm pretty confident that ISO 20400 focuses on sustainable procurement. I recall a practice question that emphasized environmental considerations in purchasing decisions.
I remember studying about ISO standards, and I feel like 20400 had something to do with supply chains, but I could be mixing it up with another standard.
Tammy
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