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(re: AGI Creator) AGI was 100% a Sierra invention. Most of the credit for AGI goes to Jeff Stephenson and myself.
SCI was 99% Jeff Stephenson’s invention, but had a fairly large team at Sierra to work on it. Some of the names that come to mind are: Larry Scott, Bob Heitman, Chris (Something?) I think the full SCI team was around 10 engineers.
SCI was the first mass-use object oriented languages. The concept of an object oriented language existed prior to SCI, but no one was using it for commercial applications. I remember the first time Jeff showed me some object oriented code. He created an object that was a door, and had methods like “open” and “close” – and, then overrode the object to make it a window (that would have the same methods). It made absolutely no sense to me. It took years before I really “got it” with respect to object-oriented technologies.