Kay is fairly explicit in crediting Simula as an influence, even though he coined the term OO during the Parc era. One thing that's important to keep in mind i

Kay is fairly explicit in crediting Simula as an influence, even though he coined the term OO during the Parc era. One thing that's important to keep in mind is that Smalltalk was designed specifically with personal computing in mind, while Simula wasn't. The real shame here is that the academic and scientific languages won out over the more holistic Smalltalk-like experience when it came to personal computing. Consequentially, we now have these incredibly powerful laptops that emulate PDPs and time sharing machines from four decades ago, that run WYSIWYG text editors just as well as or even more slowly than they did two decades ago, and that make it impossible to reason about the system in any meaningful way. There are programmers and then there are users, and the division is strict. Ain't nothing "personal" about it, really.