Source : Free On-Line Dictionary of Computing

Yourdon methodology
     
         The {software engineering} {methodology}
        developed by {Edward Yourdon} and colleagues in the 1970s and
        1980s.  "Yourdon methodology" is a generic term for all of the
        following methodologies: {Yourdon/Demarco},
        {Yourdon/Constantine}, {Coad/Yourdon}.
     
        (1995-04-07)