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DFM is one of the most used and abused buzzword today. This started when foundries where ramping up 0.13um production, many designs where hit with low yield problems. To improve yields, some design rules were modified. These design rules are sometimes referred to as DFM rules.
At the same time, CAD tool vendors started to write software that would help improve yield, or check for potential problems. They also market these tools under DFM.
There are also some design techniques that can help yield, such as memory redundancy and logic reconfiguration, which again may be thrown under the DFM world.