The requirements axe revisited with every delivery and a new rank ordering of the requirements is produced. Formal military systems follow DOD-STD-. 2167A.
N94-36489 Software Forecasting A Study of JPL
As It Is Really Done: Software Engineers
Martha Ann Griesel Jairus M. I-Iihn Kristin J. Bruno Thomas J. Fouser Robert C. Tausworthe