Which innovative product development management technique, still used in modern product development, was first formalized during the Manhattan Project?

The Manhattan Project represents one of history's most significant military product development initiatives, transforming theoretical physics into a devastating weapon that changed warfare forever. This project combined unprecedented resources, scientific talent, and industrial capacity under extreme secrecy. Test your knowledge about this landmark military product development case study that fundamentally altered global power dynamics and military strategy in the 20th century.

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Concurrent engineering (parallel development of components)
Waterfall methodology (sequential development phases)
Agile development (iterative testing and adaptation)
Six Sigma quality control (statistical defect reduction)