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.
Following on from MASHdoc_SA — and this may be the naive question:
What did you change at the same time, and can you separate the two now?
dave_SLC said:Practical: whatever you change, write down the date and the reason.
I am going to disagree with the direction of travel here. The thread has converged on the tidiest answer rather than the best-supported one, and those are not the same thing.
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Shop Reference Standardsdave_SLC said:Practical: whatever you change, write down the date and the reason.
That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.
dave_SLC said:Practical: whatever you change, write down the date and the reason.
Saving this. It is the first explanation that did not require me to already understand it. Adding it to my notes with a link back to this thread.