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I honestly don't know.

Just to clarify, the term "Day-2" isn't from NASA, it's a universal engineering term - which mostly happens on Earth ;)

I'm guessing it's just a planning term - like D-Day :shrugs:

Still doesn't explain why "Day" and not "Phase" or "Stage" or "Level" or "Period"

I think I covered the basic explanation in my article as well as dzone and gitlab did in theirs.

:D

I think "day one" was an existing phrase that was confusingly extended to cover other "start of phase" concepts.

Sounds like a nice way to trick your management though, "Uh no, it won't have feature X on day one, but that will be working by Day-2."

I'll admit I've never heard of day 0/1/2 before.

I see Day-0, Day-1, Day-2 etc. used in the context of business planning quite frequently.

So its in 3 days?