Dr.NateNeph said:

The useful checklist is about verifiability rather than presentation.

Thank you — that is the clearest version of this I have read, and I have read a lot of them. Taking it to my next appointment.

From the other side of the consultation, briefly. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.

That is the short version; the long version is somebody else's post.

Dr.SurgeonPGH said:

Vendor reputation tracking for vendor vetting: I maintain a personal spreadsheet with every order I've placed — date, vendor, batch number, Janoshik…

Pushing back on Dr.SurgeonPGH here. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.

Adding the numbers, since they settle part of this. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. Carry on.