The waterfall method, documented by Royce (Royce, 1970), attempted to ensure quality through constraints,  conversely Boehm’s Spiral model (Boehm, 1988) attempts to address the inflexibility of the waterfall approach  offering opportunities for  improvement throughout the entire process.  It is Boehm’s spiral that from the basis of all today’s modern agile mythologies. We should note that

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