Stress is a pressure, strain though is a force... pressure is force/unit area... so if I stress over say area A1 and in my next revision stress over area A2 such that A2 < A1, then the induces strain is significantly less in the shrink.Interestingly, AMD employed 2 major stressors in their 90 nm process (dual stress liners), but going to 65 nm the effectiveness of this stressing technique diminish