The ISO 21448 Safety of the Intended Functionality defines methods for failure resulting from the limitation of a functionality. ISO 26262 deals with concepts, procedures and measures for failures resulting from random hardware failures or systematic HW/SW failures.
Many experts see the SOTIF standard as a normative support for the realization of autonomous driving. This view is supported by statements in chapter 1 of the standard. There it is explicitly mentioned that ISO 21448 should not be applied to well-proven systems such as the airbag etc., but rather to innovative, new and complex functions such as ADAS.
The following article gives an overview of the contents of the standard and discusses in a critical way the point whether ISO 21448 and ISO 26262 really help to enable autonomous driving. Read more