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Software occupy an increasingly prominent place in the critical embedded systems : their size and complexity is increasing , while their criticality also continues to rise. In this context, how the aeronautical, space , automotive, industrial domains are facing these challenges ? Application of international standards is essential to define the scope of practices recognized by the community as " state of the art " in terms of producing safety critical software . What are these practices, the principles on which they are built ? Starting with (re)defining the concept of software criticality and placing this concept in the whole system, then we will try to answer all these questions. During this presentation , we will illustrate the point with examples from aeronautics, air traffic control , space , automotive or railway . Finally, we will take a look at some trends , particularly through standards recently released.