Before revision: Software level The Software Level, also known as the Design Assurance Level (DAL) or also '" Item Development Assurance Level "' (IDAL) RTCA / DO-178B "Software Considerations in Airborne Systems and Equipment Certification", p. 7is 116.
After revision: Software level The Software Level, also known as the Design Assurance Level (DAL) or also '" Item Development Assurance Level "' (IDAL) as defined in ARP4754 (DO-178C only mentions IDAL as synonymous with Software LevelRTCA / DO-178C "Software Considerations in Airborne Systems and Equipment Certification", p. 116.