That is not the case with behavioral and change processes,where the voice of external customers can not be heard. In fact, such a link between the voice of external customers,and behavioral and change processes has not been established. Putting it differently, to the extent that Six Sigma projects fail to address the voice of internal customers,they fail to improve behavioral and change processes.Therefore, Six Sigma programs can not develop, maintain,and establish sustainable process improvement programs since Six Sigma programs have not been designed to integrate all processes in their process improvement efforts.