This third volume in the St. Louis Metromorphosis series continues to tell the story, from an urban planning perspective, of how metropolitan St. Louis has changed and is changing. There are many factors that shape the St. Louis area. Relative to planning there are physical plans that determine the built environment and there are plans by numerous organizations that determine what happens within the built environment. St. Louis has a rich history of both forms of planning that heretofore have not been documented collectively. Planning occurs at the regional, subregional, and neighborhood levels, as well as within specific sectors such as education, healthcare, and workforce development. One of the most dramatic planned changes ever to occur in St. Louis is the Jefferson National Expansion Memorial – the Gateway Arch and the parkland that surrounds it, including the Old Courthouse. The Gateway Arch is commonly acknowledged as a symbol for St. Louis, but it is more than that. It is also a metaphor for the process of planning.