Complex systems (quote)
...Herbert Simon's argument that modular design in computers and minds is a special case of modular, heirarchical design in all complex systems. Bodies contain tissues made of cells containing organelles; armed forces comprise armies which contain divisions broken into battalions and eventually platoons; books contain chapters divided into sections, subsections, paragraphs, and sentences; empires are assembled out of countries, provinces, and territories. These "nearly decomposable" systems are defined by rich interactions among the elements belonging to the same components and few interactions among elements belonging to different components. Complex systems are hierarchies of modules because only elements that hang together in modules can remain stable long enough to be assembled into larger and larger modules. Simon gives the analogy of two watchmakers, Hora and Tempus: The watches the men made consisted of about 1,000 parts each. Tempus had so constructed his that if ...