GNU Smalltalk is an implementation that closely follows the Smalltalk-80 language as described in the book `Smalltalk-80: the Language and its Implementation" by Adele Goldberg and David Robson. The Smalltalk programming language is an object oriented programming language. Unlike other Smalltalks , GNU Smalltalk emphasizes Smalltalk"s rapid prototyping features rather than the graphical and easy-to-use nature of the programming environment. Therefore, even though we have a nice GUI environment including a class browser, the goal of the GNU Smalltalk project is currently to produce a complete system to be used to write your scripts in a clear, aesthetically pleasing, and philosophically appealing programming language.