Identifying an instance of F4 Manifestation Singleton that is representative for an instance of F2 Expression makes it possible in turn to identify an instance of F2 Expression that is representative for an instance of F1 Work, and to decide what should be regarded as the title of the work. The title of an Expression may not be one taken from a representative Manifestation Product Type or Manifestation Singleton. A given expression can have more than one representative Manifestation Singleton. It is a shortcut for the more developed path: F2 Expression R48B was assigned by F41 Representative Manifestation Assignment R53 assigned F4 Manifestation Singleton.