This lecture covers the process of modeling stone structures, including the assignment of components, collaborative work, and the inclusion of individual elements in a common vault. Students will model their own voussoir based on group assignments, with the possibility of large-scale collaboration. The instructor guides the students through the procedures of collaborative work and the optional inclusion of their voussoir in the common project. The lecture emphasizes the importance of systematic document management, including deletion, archiving, and restoration processes. Students are encouraged to clear their trash promptly after making decisions. The lecture also delves into the creation of geometric families and the declaration of drivers for stone structure modeling.