ARP4754A and ED79A were released by SAE and EUROCAE in December 2010. The document title has changed to "Guidelines For Development Of Civil Aircraft and Systems". ARP4754A recognizes AMC 25.1309 (published in 2003) and AC 25.1309-1B-Arsenal draft. This revision expands the design assurance concept for application at the aircraft and system level and standardizes on the use of the term development assurance. As a consequence, Functional Development Assurance Level (FDAL) is introduced for aircraft and systems concerns and the term Design Assurance Level has been renamed Item Development Assurance Level (IDAL). Furthermore, the addition of definitions for "Error", "Failure", and "Failure Condition" are acknowledge as derived from AMC 25.1309. The qualitative and quantitative classification of failure conditions by severity and probability now used by ARP4754A and ARP4761 are defined in AMC 25.1309/AC 25.1309–1B-Arsenal draft.