A workflow integration architecture for improving the coordination of software, hardware, and firmware developments leading to shorter product development schedules and thus reduced cost is presented. The workflow integration architecture has a product structure module that includes a hardware design application component, a software design application component, a firmware design application component, a product requirements component, and a design documents component. The architecture further includes a revision control repository database for permanently storing development tree or subtree including file system objects such as directories, files, symbolic links and hardware links, an external repository database for storing files, path-to-file information, and URL link information relating to product design related documents at a remote location connected to the product structure module via a communications network, a requirements system database for storing product requirements data, an external documents file database for storing technical documents, and a plurality of connector components for linking the components of the product structure module to the databases, whereby any change to one of the databases are propagated to the other databases.