I wouldn't say work has "Officially" started on the next update to 23 Sisters, but it has technically begun.
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The professor that taught my freshman level Cobol class about a thousand years ago told us that most programmers, when given a project, would sit at their desks and stare out their window for about two weeks, and then write the code (sometimes without stopping) over the next 48 hours. So, while they had "technically" started, for the first two weeks no one could see the progress because it was all in their heads.
Of course, this was back in the day when coders were rarer, highly respected for the voodoo/magic/supernatural things they could do, and people actually still had offices. He had two classes at that level, about 300-400 of us in each; I ended up #4. For better or worse, MIS wasn't my major, so I didn't keep going with it. It was kind of a fun logic game, though.
Even if you don't have anything down on paper or rendered yet, you "technically" started the moment your mind went to that project.