The genesis of the roadmap is an expert based procedure that can be carried out with single experts or in groups of up to 10 persons. Starting with an empty matrix (the four dimensions versus a timeline of approximately 10 years from today), the experts are asked to discuss the topic and to identify single aspects/key issues of the future development concerning the four dimensions. These aspects and issues are written on “event cards” and placed in the matrix. Step by step, the matrix is filled with additional cards while existing cards can be rearranged or split-up (e.g. when an aspects needs to be divided into two distinctive sub aspects) etc. At the end of the session, the set of cards is finalised and prominent connections and dependencies — especially cross-dimensional ones — are indicated by lines and arrows.