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In the 1970s, the first version of the [[Smalltalk]] programming language was developed at [[Xerox PARC]] by [[Alan Kay]], [[Dan Ingalls]] and [[Adele Goldberg (computer scientist)|Adele Goldberg]]. Smalltalk-72 included a programming environment and was [[Dynamic programming|dynamically typed]], and at first was [[Interpreter (computing)|interpreted]], not [[Compiler|compiled]]. Smalltalk became noted for its application of object orientation at the language-level and its graphical development environment. Smalltalk went through various versions and interest in the language grew.<ref name="Bertrand Meyer 2009 329">{{Cite book|title=Touch of Class: Learning to Program Well with Objects and Contracts|author=Bertrand Meyer|publisher=Springer Science & Business Media|year=2009|isbn=978-3-540-92144-8|pages=329|bibcode=2009tclp.book.....M}}</ref> While [[Smalltalk]] was influenced by the ideas introduced in Simula 67 it was designed to be a fully dynamic system in which classes could be created and modified dynamically.<ref name="st">{{Cite web|first=Alan |last=Kay |url=http://gagne.homedns.org/~tgagne/contrib/EarlyHistoryST.html |title=The Early History of Smalltalk |access-date=13 September 2007 |url-status=dead |archive-url=https://web.archive.org/web/20080710144930/http://gagne.homedns.org/~tgagne/contrib/EarlyHistoryST.html |archive-date=10 July 2008 }}</ref>
In the 1970s, Smalltalk influenced the [[Lisp (programming language)#Language innovations|Lisp community]] to incorporate [[Lisp (programming language)#Object systems|object-based techniques]] that were introduced to developers via the [[Lisp machine]].{{cn|reason=The dates don't line up, Flavors is 1982 and LOOPS is 1983 so they were most likely influenced by Smalltalk-80|date=August 2023}} Experimentation with various extensions to Lisp (such as LOOPS and [[Flavors (programming language)|Flavors]] introducing [[multiple inheritance]] and [[mixins]]) eventually led to the [[Common Lisp Object System]], which integrates functional programming and object-oriented programming and allows extension via a [[Meta-object protocol]]. In the 1980s, there were a few attempts to design processor architectures that included hardware support for objects in memory but these were not successful. Examples include the [[Intel iAPX 432]] and the [[Linn Products|Linn Smart]] [[Rekursiv]].
In 1981, Goldberg edited the August issue of [[Byte Magazine]], introducing Smalltalk and object-oriented programming to a wider audience. In 1986, the [[Association for Computing Machinery]] organised the first ''Conference on Object-Oriented Programming, Systems, Languages, and Applications'' (OOPSLA), which was unexpectedly attended by 1,000 people. In the mid-1980s [[Objective-C]] was developed by [[Brad Cox]], who had used Smalltalk at [[ITT Inc.]], and [[Bjarne Stroustrup]], who had used Simula for his PhD thesis, eventually went to create the object-oriented [[C++]].<ref name="Bertrand Meyer 2009 329"/> In 1985, [[Bertrand Meyer]] also produced the first design of the [[Eiffel (programming language)|Eiffel language]]. Focused on software quality, Eiffel is a purely object-oriented programming language and a notation supporting the entire software lifecycle. Meyer described the Eiffel software development method, based on a small number of key ideas from software engineering and computer science, in [[Object-Oriented Software Construction]]. Essential to the quality focus of Eiffel is Meyer's reliability mechanism, [[Design by Contract]], which is an integral part of both the method and language.
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