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Royce's final model illustrated that feedback could (should, and often would) lead from code testing to design (as testing of code uncovered flaws in the design) and from design back to requirements specification (as design problems may necessitate the removal of conflicting or otherwise unsatisfiable/undesignable requirements).[citation needed] In the same paper Royce also advocated large quantities of documentation, doing the job "twice if possible" (a sentiment similar to that of Fred Brooks, famous for writing the Mythical Man Month — an influential book in software project management — who advocated planning to "throw one away"), and involving the customer as much as possible (a sentiment similar to that of extreme programming).