Whereas most of the cases analyzed in this book pertain to concept formation in relatively well-bounded constellations of activity systems, the case of Housing First 2.0 discussed in this chapter represents concept formation in a broad field of activities aimed at the eradication of homelessness, located at multiple levels from national policy and government strategy down to counties, cities, and housing units working with individual clients. As such, the concept formation process is also lengthy and far from linear. The chapter traces a process of practical experimentation and supportive research that led to the emerging germ cell concept of Housing First 2.0. It is still too early to say to what extent and in what timeframe the new concept may stabilize, generalize, and actually transform homelessness work nationwide. In other words, ascending to the new expanded concrete has only begun. The ascending to the concrete needs to be followed and supported over the long haul.