TC9/SC2 should continue with efforts to introduce a more robust treatment of the durability issue YES / NO. If 'YES' should more robust durability testing be introduced at type approval YES / NO. Durability testing should be introduced at initial verification (using some form of two-part verification) YES / NO. More robust durability requirements should be addressed under ‘subsequent metrological control’ (subsequent and in-service verification) YES / NO. Comments/Suggestions for laboratory durability tests.