DO-178 and DO-254 are both standards developed by the Radio Technical Commission for Aeronautics (RTCA) to ensure the safety and reliability of electronic systems used in the aerospace industry. While DO-178 applies to software development, DO-254 is specific to electronic hardware development

Find out method and apparatus to classify Design output in to  Level E to Level A of DO 254. Where Level A is not good and Level E is good enough.