Buildings made from industrially prefabricated elements that are assembled on-site have shaped architecture across Europe since the post-war period. In Switzerland, systematic constructions were also created on a large scale: schools, community centers, clinics, industrial or residential buildings. Contractors like Ernst Göhner developed affordable housing in innovative large-scale settlements, radically changing the landscape. Architectural and planning firms developed independent building systems. Advanced methods of prefabrication, transportation, and assembly ensured location independence and quick, cost-effective realization. Modular building block systems guaranteed future expansions. It was not until the oil crisis of 1973 and its economic consequences that the construction boom came to an end. Concrete and serially produced large buildings became symbols of a monotonous speculative architecture focused solely on profit. After "the slab" fell into disrepute in the 1990s, it is now gradually regaining appreciation. This book aims to counteract the lingering disdain for serially produced buildings from the 1940s to the 1970s, which make up the majority of Switzerland's building stock. The scientifically grounded study offers an unbiased assessment of the building systems and structures, along with a comprehensive inventory. It highlights the opportunities and challenges of long-term preservation and use, providing fundamental insights into repairability and energy efficiency improvements. ICOMOS Suisse, working group System & Series, consists of experts from the fields of social history, architectural history, architecture, building physics, civil engineering, and heritage conservation.