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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 [[Type system#Dynamic_type_checking_and_runtime_type_information|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
|title=The early history of Smalltalk
|author=[[Alan C. Kay]]
|journal=[[ACM SIGPLAN Notices]]
|volume=28
|issue=3
|pages=69–95
|date=March 1993
|doi= 10.1145/155360.155364
}}
{{open access}}
</ref>
During the late 1970s and 1980s, object-oriented programming rose to prominence. The [[Flavors (programming language)|Flavors]] object-oriented Lisp was developed starting 1979, introducing [[multiple inheritance]] and [[mixins]].<ref>{{cite conference |last1=Moon |first1=David A. |author-link1=David A. Moon |date=June 1986 |title=Object-Oriented Programming with Flavors |book-title=Conference proceedings on Object-oriented Programming Systems Languages and Applications |pages=1–8 |isbn=978-0-89791-204-4 |conference=[[OOPSLA]] '86 |doi=10.1145/28697.28698 |s2cid=17150741 |url=https://www.cs.tufts.edu/comp/150FP/archive/david-moon/flavors.pdf |access-date=2022-03-17}}</ref> In 1981, Goldberg edited the August issue of [[Byte Magazine]], introducing Smalltalk and object-oriented programming to a wide audience.<ref>{{cite news |title=Introducing the Smalltalk Zoo |url=https://computerhistory.org/blog/introducing-the-smalltalk-zoo-48-years-of-smalltalk-history-at-chm/ |work=CHM |date=17 December 2020 |language=en}}</ref> LOOPS, the object system for [[Interlisp]]-D, was influenced by Smalltalk and Flavors, and a paper about it was published in 1982.<ref>{{cite conference | title=LOOPS: data and object oriented Programming for Interlisp|date=1982|conference=European AI Conference|last1=Bobrow|first1=D. G.|last2=Stefik|first2=M. J|url=https://www.markstefik.com/wp-content/uploads/2011/04/1982-Bobrow-Stefik-Data-Object-Pgming.pdf}}</ref> In 1986, the [[Association for Computing Machinery]] organized the first ''Conference on Object-Oriented Programming, Systems, Languages, and Applications'' (OOPSLA), which was attended by 1,000 people. Among other developments was 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]].
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