According to N. J. Habraken intimate & unceasing interaction between people & the forms they inhabit uniquely defines built environment. The Structure of the Ordinary the culmination of decades of environmental observation & design research is a recognition & analysis of everyday environment as the wellspring of urban design & formal architecture. The authors central argument is that built environment is universally organized by the Orders of Form Place & Understanding. These three fundamental interwoven principles correspond roughly to physical biological & social domains. Historically ordinary" environment was the background against which architects built the "extraordinary." Drawing upon extensive examples from archaeological & contemporary sites worldwide the author illustrates profound recent shifts in the structure of everyday environment. One effect of these transformations Habraken argues has been the loss of implicit common understanding that previously enabled architects to formally enhance & innovate while still maintaining environmental coherence. Consequently architects must now undertake a study of the ordinary as the fertile common ground in which form- & place-making are rooted. In focusing on built environment as an autonomous entity distinct from the societies & natural environments that jointly create it this book lays the foundation for a new dialogue on methodology & pedagogy in support of a more informed approach to professional intervention."