'<h2 class=abstract> Session: Components and languages </h2> <p class=papertitle> Dynamic recomposition of components and object identity <p class=paperauthor> P. Costanza, O. Stiemerling -- University of Bonn, Germany <p class=paperabstract> Dynamic recomposition of components in a program imposes advanced requirements on the expressive power of object-oriented programming languages. For example,the replacement of a component with another reveals consistency problems stemming from the fact that the concept of object identity tries to fulfil the distinct purposes of reference and comparison. By clearly separating the two notions and providing means to manipulate them independently, the consistency problems can completely be avoided.  '