An interface definition that specifies the functionality of humanly accessed functions within a software program is parsed into statements by a parser in conjunction with a dictionary. The parsed statements are converted to formatted statements by a plurality of formatters resulting in expression of the interface definition in a plurality of selected formats. The selected formats comprise source code formats and various documentation formats. Files generated from source code formatters, such as "C++" formatters, are included in the software build process and facilitate restricting software development to the specified functionality. Changes to the interface definition are propagated to the selected formats resulting in software functionality that is consistent with the various forms of documentation such as on-line help and printed documentation. The present invention was developed in response to the needs of multi-platform product development and facilitates timely and accurate coordination between software development and documentation efforts.