Kay is said to have coined the term "object-oriented", but his conception of object orientation differs considerably from that of Dahl and Nygaard as well as fr

Kay is said to have coined the term "object-oriented", but his conception of object orientation differs considerably from that of Dahl and Nygaard as well as from all current OO languages. Dahl and Nygaard invented the first object-oriented programming language (Simula 67) but didn't use the term. And yes, active objects reacting to messages (events) passed to them were already part of Simula I (1962). The referenced article - like many others - moreover quotes Kay incompletely; Kay in the sentence next to the one quoted in the article said "the important thing here is that I have many of the same feelings about Smalltalk"; see https://www.youtube.com/watch?v=oKg1hTOQXoY&t=633s https://www.youtube.com/watch?v=oKg1hTOQXoY&t=633s. Smalltalk-76 and 80 (in contrast to Smalltalk-72) implement inheritance and virtual methods as it was done in Simula 67, just like C++ and Java do.