Process and Product Quality Assurance (PPQA) for NASA Ames Research Center

CMMI has its origins in software engineering dating back to the late 1980’s
NASA had sufficient experience in CMM/CMMI when it was made as a requirement in 2004, which wasn’t and still isn’t the case for Six Sigma)
CMMI is essentially the de-facto model for improvement within the professional software community
CMM/CMMI was the recommended model for improving NASA software Aerospace Safety Advisory Panel (ASAP) and was approved by NASA HQ