抄録
Recently, engine development has tended to require the evaluation of increasing numbers of external components such as auxiliary emission control devices and modularized structural components, which often have to be tested repeatedly.
This must be done promptly if development schedules are to be maintained.
For this purpose, design for six sigma（DFSS）technology can be applied. This involves four checks:（1）Does everyone agree on the main themes of the project?（2）Are the target values reasonable?（3）Has anything been left undone, or is there anything more to do?（4）When the IDDOV steps（identify, define, develop, optimize, validate）are applied, have the issues been isolated and dealt with?
https://ror.org/000ycsz94 
