This part introduction presents an overview of the key concepts discussed in the subsequent chapters. The part aims to indicate quite different approaches to be taken when considering the key issue of reductionism versus a more or less strong position in complexity theory. It describes the way in which individuals and social groups live and develop with the billions of processors and software systems in context-aware and anticipatory ubiquitous computing and agree that it is far from obvious that the distinction between human and machine can be upheld in any strict or traditional sense. The part proposes that the complexity of ubicomp culture and surveillance systems is to be met by a nuanced reductionism, specifically the reductions of complexity in a systems theory. Cultural and technical software processes cross in and as individuations — they constitute something like the liquid limit or soft membrane of organized technocultural complexity.