Software development is becoming a major cost in today's military weapon systems. To address this problem, the proposed approach employs a "virtual" domain oriented architecture, an interactive editor, and a library of "intelligent" modules. The intelligent modules have a dual viewpoint. First, they are the domain oriented transformations which form the op-codes of virtual architecture. This virtual architecture contains an infinite set of transformation units which can communicated in an arbitrary fashion. Second, the modules contain "synthesis instructions and constraints" which drive an interactive editor during a "composite" synethesis process. Composites produced by the synthesis process also contain appended information for the interactive editor. In this fashion, a hierarchial software structure can be developed without using a high level language. After development of the software structure (virtual architecture program), constraints of the target architecture can be overlaid to generate the target processor program. The proposed approach views digital subsystems as objects having transformation properties. "Software" represent how these transformation agents are interfaced. Past work in analog computers is related to the proposed concept.