Complex sentence: Proponents of DMAIC techniques might claim that DFSS falls under the general rubric of "six sigma" and it is often seen that the products used for DFSS techniques vary widely from the products used for DMAIC six sigma.
Split into simpler sentences: Proponents of DMAIC techniques might claim that DFSS falls under the general rubric of "six sigma". It is often seen that the tools used for DFSS techniques vary widely from those used for DMAIC six sigma.