I’m hoping you can provide some clarity on the ISO guidelines for certificates, specifically the unique ID. Is this ID unique to the certificate or the certificant? If it is unique to the certificant and the certificant holds multiple designations, can this same ID be on each certificate that they hold or do we need to augment it in some way? Does it have to be updated in any way when a new certificate is issued at recertification? If it is unique to the certificate, does this ID need to be updated each time a new certificate is issued at recertification? For the certification effective date, is this the date the certification was granted, the date of recertification, or is it best practice to include both?

I like one # for all certifications because it’s simpler… but then when someone wants to verify the certification, you have to make sure you filter by certification before you respond.

If you do multiple IDs for multiple certs, then the candidate has a raft of numbers to remember and document, and you have determine see which one to refer to when you correspond.  Not ideal.

Their ID, whichever way you do it, should be good for the life of the certification, meaning the original and all subsequent recerts.

The recert date is the date the certification was issued.  It is also the date on which the recertification was issued.  You may choose to include a field, “Certified since 2014”  or “Initially certified 2016” or whatever, but this is optional.  Most people don’t do it because how do you handle gaps in certification?