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At a fascinating talk at the XP 2002 conference1, Enrico Zaninotto, an economist, analyzed the underlying thinking behind agile ideas in manufacturing and software development. One aspect I found particularly interesting was his comment that irreversibility was one of the prime drivers of complexity. He saw agile methods, in manufacturing and software development, as a shift that seeks to contain complexity by reducing irreversibility—as opposed to tackling other complexity drivers. I think that one of an architect’s most important tasks is to remove architecture by finding ways to eliminate irreversibility in software designs.