A bout working standard

Hi, colleagues.
There are some questions need you help.Please give me some information.
1,Is there any difference between working standard and secondary standard?
2,"Analytical procedures used to characterize a reference standard should not rely solely on comparison testing to previously designated reference standard." Taken from FDA guidance.So,what analytical procedures used to characterize a reference standard are acceptable?
3,How do I prepare the SOPs of reference standard characterization?
Thank you advanced.

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