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As part of the [[One Laptop per Child]] project, a sequence of Smalltalk-based languages has been developed, each designed to act as an introduction to the next. The structure is Scratch to [[Etoys (programming language)|Etoys]] to [[Squeak]] to any [[Smalltalk]].<ref>{{cite web|last=Cavallo|first=David|title=Learning Squeak from Scratch|publisher=One Laptop Per Child News|date=May 28, 2007|url=http://www.olpcnews.com/software/applications/learning_squeak_scratch.html|access-date=April 3, 2009}}</ref> Each provides graphical environments that may be used to teach not only programming concepts to kids but also physics and mathematics simulations, story-telling exercises, etc., through the use of [[Constructivism (philosophy of education)|constructive learning]]. Smalltalk and Squeak have fully featured application development languages that have been around and well-respected for decades; Scratch is a children's learning tool.
* [[Scratch (programming language)|'''Scratch''']] 1.0 is implemented in Smalltalk. See [[#Children|below]] for more information.
* [[Etoys (programming language)|'''Etoys''']] is based on the idea of programmable [[Virtuality|virtual]] entities behaving on the computer screen. Etoys provides a media-rich authoring environment with a simple, powerful scripted object model for many kinds of objects created by end-users. It includes [[2D computer graphics|2D]] and [[3D computer graphics|3D]] [[graphics]], [[image]]s, [[Plain text|text]], particles, presentations, web pages, [[video]]s, sound and [[Musical Instrument Digital Interface|MIDI]] (the ability to share desktops with other Etoys users in [[real-time computing|real-time)]]. Many forms of immersive [[mentorship|mentoring]] and play can be done over the [[Internet]]. It is [[Multilingualism|multilingual]] and has been used successfully in the [[United States]], [[Europe]], [[South America]], [[Japan]], [[Korea]], [[India]], [[Nepal]] and elsewhere. The program is aimed at children between the ages of 9-12.<ref>{{cite book|last=Ducasse|first=Stéphane|url=http://smallwiki.unibe.ch/botsinc/|title=Squeak: Learn Programming with Robots (Technology in Action)|publisher=Apress|year=2005|isbn=1-59059-491-6|pages=289 in ch 24: ''A tour or eTOY''}}</ref>
* '''[[Squeak]]''' is a modern, open-source, full-featured implementation of the Smalltalk language and environment. Smalltalk is an [[Object-oriented programming|object-oriented]], [[Type system|dynamically typed]], [[reflective programming]] language created to underpin the "new world" of computing exemplified by "human-computer symbiosis".<ref name="History">{{cite web|last=Kay|first=Alan|url=http://gagne.homedns.org/~tgagne/contrib/EarlyHistoryST.html|title=The Early History of Smalltalk|access-date=September 13, 2007|archive-url=https://web.archive.org/web/20110429192453/http://gagne.homedns.org/~tgagne/contrib/EarlyHistoryST.html|archive-date=April 29, 2011|url-status=dead}}</ref> Like [[Lisp (programming language)|Lisp]], it has [[Persistence (computer science)#Built-in to operating systems and programming languages|image-based persistence]], so everything is modifiable from within the language (see [[Smalltalk#Reflection]]).<ref>For further discussion of why this make it easy see [[Meta-circular evaluator]]</ref> It has greatly influenced the industry introducing many of the concepts in object-oriented programming and [[just-in-time compilation]]. Squeak is the vehicle for a wide range of projects including multimedia applications, educational platforms and commercial [[web application]] development. Squeak is designed to be highly portable and easy to debug, analyze and change, as its [[virtual machine]] is written fully in Smalltalk.
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