If you'd like to know about the early history of Smalltalk, then I'd recommend Alan Kay's "The Early History of Smalltalk" (in this case say pages 19-31) [pdf]

If you'd like to know about the early history of Smalltalk, then I'd recommend Alan Kay's "The Early History of Smalltalk" (in this case say pages 19-31) [pdf] https://web.archive.org/web/20230503050530/http://www.metaobject.com/papers/Smallhistory.pdf https://web.archive.org/web/20230503050530/http://www.metaob... "… since things can be done with a dynamic language that are difficult with a statically compiled one, I just decided to leave inheritance out as a feature in Smalltalk-72, knowing that we could simulate it back using Smalltalk's LISPlike flexibility. … By the time Smalltalk-76 came along, Dan Ingalls had come up with a scheme that was Simula-like in its semantics but could be incrementally changed on the fly to be in accord with our goals of close interaction." p31