Abstract: An object oriented program editor operative on a text source in a language having syntax properties having a lexical analyzer, a parser, a codeblock generator and a graphical user interface. The lexical analyzer identifies language tokens in the text source. The parser which is coupled to the lexical analyzer associates syntax properties with the tokens. The codeblock generator which is coupled to the parser, groups tokens into a tree of codeblocks. The graphical user interface receives and implements user modifications of the codeblocks in a manner consistent with the programming language. A system for generating source code in a program language with respect to an object model having a plurality of classes and relations among such classes having a class selection interface, an action selection interface and a source code generator. The class selection interface is used for user selection of a chosen class.