Thanks for sharing it as it forced me to look it up. The Wikipedia article has nice summary and traces its effects:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;CLU_%28programming_language%29" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;CLU_%28programming_language%29</a><p>I knew about some of Liskov&#x27;s work but didn&#x27;t know CLU was her precursor to OOP. Among other things. Pretty forward-thinking. I see it as a nice space between Structured Programming and OOP where people wanting some, not all, OOP constructs might be comfortable.