A language for the functional specification and module design phases of the software life cYcle, first presented in Berzins and GraY' s 1985 paper. Not unlike PDL. ["AnalYsis and design in MSG.84: formalizing functional specifications", Valdis Berzins, Michael GraY, Volume 11 Issue 8, IEEE Transactions on Software Engineering, Aug 1985]. (2003-05-15)