The digital transformation of traditional workflows challenges small and medium-sized and industrial enterprises likewise. Interactive systems have to be built to assist the people within their daily tasks as suitable as possible. Existing software engineering methods seems to be unsufficient because they don’t consider end users in terms of active involvement during the development process and thus lack in the quality of the resulting product. In addition, digital transformation is an ongoing process and needs user participation as well as a continuous requirements refinement. Therefore, this paper describes an iterative task-driven approach to enable an incremental development based on a sustainable model that is continuously improved due to user reviews on runnable parts of the user interface.