This is stooop (a Simple Tcl Only Object Oriented Programming scheme) version 2.6. Stooop is implemented in a single sourceable file and uses simple techniques to provide object orientation to the great Tcl language. If you know C++, stooop will be easy to use for you. Using the familiar new, delete and virtual keywords and a few coding conventions, you can start object oriented Tcl code right away, as the following simple example shows: source stooop.tcl proc circle::circle {this canvas diameter} { set circle($this,diameter) $diameter set circle($this,canvas) $canvas set circle($this,id) [$canvas create oval 0 0 $diameter $diameter] } proc circle::~circle {this} { $circle($this,canvas) delete $circle($this,id) } proc circle::move {this x y} { $circle($this,canvas) move $circle($this,id) $x $y } pack [canvas .c] set c [new circle .c 50] update; after 1000 circle::move $c 10 10 update; after 1000 delete $c Stooop supports single and multiple inheritance, data encapsulation (all member data is public), dynamic binding and runtime type identification. Member data is automatically unset when objects are deleted. As stooop is entirely written in Tcl, it will run on all Tcl supported platforms, including Windows and the Mac Intosh, if you have Tcl version 7.5 or above, including 8.0. Additionally, a C dynamically loadable extension is available for maximum performance (see the file stooop.c for more information on how to create the library). Stooop works be redefining the Tcl proc command, so that object oriented helper code is added to member procedures. The new, delete, virtual and classof operators are implemented as Tcl procedures, or alternatively dynamically loadable as an extension for better performance. Stooop was implemented with a constant concern for performance. Member data is stored in Tcl associative arrays, which are best for random data access. Object oriented helper code is kept as small and efficient as possible. Typically, only a couple of Tcl lines are added to a member procedure definition. Program startup time will be slightly increased due to proc preprocessing, but runtime overhead is kept to a minimum. Use of object oriented techniques may actually improve the performance of your code. A full HTML documentation, HTML class browser, simple demo script, graphical demo with composite pattern and test files are provided. You may also run the test program and look at the test scripts for examples. There is also a utility for creating packages (in the Tcl sense) from stooop compatible class files. There is now a companion package to stooop: scwoop (a Simple Composite Widget Object Oriented Package) Scwoop is implemented in a single sourceable file and uses simple techniques to provide composite widget (also known as mega widget) support to the great Tk widget library. Whether you like it (or hate it), please let me know. I would like to hear about bugs and improvements you would like to see. I will correct the bugs quickly, especially if you send me a test script. Jean-Luc Fontaine (mailto:jfontain@apogee-com.fr)