In 1990 appeared the first edition of this novel design constructions and it was enthusiastically received. Starting from a base, sections for the different variants can be created self-reliant. The peculiarity of the section system by Jansen and Ruediger lies in its visual presentation: Directly inserted symbols into the sectional drawing show the respective steps Explanatory texts are limited to the essentials. The cuts are represented by continuous two-tone: base in black, all changes in red. This keeps the drawings clear and well understood.