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This paper addresses a key issue that arises in run-time recomposition of software: the transfer of nontransient state between old components and their replacements. We focus on the concept of collateral change, which refers to the set of recomposition actions that must be applied atomically for continued correct execution. We describe Perimorph, a system that supports compositional adaptation of both functional and nonfunctional concerns by explicitly addressing collateral change. Thedoi:10.1109/icdcsw.2004.1284051 dblp:conf/icdcsw/KastenM04 fatcat:ypcim55mgrdjpedm5aayommdaq