A collection whose members are 'unified', i.e. organized according to a certain schema that can be represented by a Description. Typically, a configuration is the collection that emerges out of a composed entity: an industrial artifact, a plan, a discourse, etc. E.g. a physical book has a configuration provided by the part-whole schema that holds together its cover, pages, ink. That schema, based on the individual relations between the book and its parts, can be represented in a reified way by means of a (structural) description, which is said to 'unify' the book configuration.