Thanks again for your effort. I had a look at all references, but still consider Robert J. Bobrow's 1971 text the first use of the term "object-oriented" in a

Thanks again for your effort. I had a look at all references, but still consider Robert J. Bobrow's 1971 text the first use of the term "object-oriented" in a CS publication. Ref [1] looks like yet an earlier hit, but the book is about systems engineering and management, not computer science; though I did only have access to a few pages of the book, so it could be a borderline case; the PREFACE says, that "Volume 6 comprises a collection of authoritative papers on techniques and standards specific to systems engineering, or on [...] organization therory, psychology, operations research and mathematics". Your hit apparently is in Volume 6. Ref [2] is not a hit from my point of view; it uses the terms "object" and "class", which was the official terminology of Simula 67 at that time. The use of "block-structure/procedure orientation" looks like an early attemtpt for a term to differentiate Simula from the other contenders, but it's definitely not related with the term "object-oriented". Refs [3] to [7] document the early use of the term "object" in computer sciences, but not "object-oriented". So I think we can conclude the search in the sixties, and in any case you deserve credit for finding the earliest use of the term in 1971. I will next focus on the earliest use of the term for a programming language, which so far seems to be - as already mentioned - the 1976 MIT CSG Memo 137 by Jones and Liskov; I will check other publications by Liskov from that time.