Editing Alan Kay (section)

=== Tweak ===
In 2001, it became clear that the Etoy architecture in Squeak had reached its limits in what the Morphic interface infrastructure could do. [[Andreas Raab]], a researcher in Kay's group then at Hewlett-Packard, proposed defining a "script process" and providing a default scheduling mechanism that avoided several more general problems.<ref>{{cite web |last=Raab |first=Andreas |author-link=Andreas Raab |url=http://tweakproject.org/ABOUT/FAQ/OriginalTweakMemo/ |archive-url=https://web.archive.org/web/20111002012532/http://tweakproject.org/ABOUT/FAQ/OriginalTweakMemo/ |archive-date=October 2, 2011 |title=Events, Scripts & Multiple Processes |date=July 6, 2001 |access-date=June 7, 2009}}</ref> The result was a new user interface, proposed to replace the Squeak Morphic user interface. [[Tweak programming environment|Tweak]] added mechanisms of islands, asynchronous messaging, players and costumes, language extensions, projects, and tile scripting.<ref>{{cite web |url=http://tweakproject.org/TECHNOLOGY/Whitepapers/ |title=Tweak: Whitepapers |archive-url=https://web.archive.org/web/20111002012629/http://tweakproject.org/TECHNOLOGY/Whitepapers/ |archive-date=October 2, 2011}}</ref> Its underlying object system is [[Class (computer programming)|class-based]], but to users (during programming) it acts as if it were [[Prototype-based programming|prototype-based]]. Tweak objects are created and run in Tweak project windows.