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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Hierarchical Design Methodology
   HDM
      <programming> (HDM) A method for specifying software and
      systems using hierarchies of abstract machines, developed by
      Larry Robinson at SRI International circa 1975-1976.  The
      specifications were written in SPECIAL.
      (2012-07-08)