We ideally combine highly agile processes in the concept phase and a clearly defined project structure in the detailing and series implementation. This allows us to combine the best of both worlds: Short intermediate sprints at the beginning enable a high degree of concept flexibility and a careful evaluation of the technical and design possibilities. On this basis, a clear product definition can then be identified, which in turn can be implemented very stringently in terms of deadlines and costs. Our project modules are based on reflected and clearly described specifications and product requirements. In our calculations, we use a transparent presentation of the specific project steps, costs, disciplines involved and deliverables as well as the possible optional modules. Milestones are clearly defined and recorded with detailed documentation in presentations and minutes. Project content is processed in a phased approach. Billing also takes place from project phase to project phase. Adjustments to new findings are made in a very agile manner and within the budget framework or with clearly identified and agreed additional items. Rights of use are regulated transparently, there are no hidden license fees.