The amendment to SID and STAR procedures addresses the difficulties reported by a number of States, air navigation services providers and aircraft operators on the application of existing PANS provisions, most notably with the issue of the applicability of published level or speed restrictions. The established solution was designed to provide aircraft with explicit indications with regard to what is expected in terms of speed and level at all times. The new procedures rely on the use of key phraseologies (CLIMB VIA / DESCEND VIA) to explicitly indicate to flight crews if they should abide by speed and level restrictions associated to a given procedure. Specific phraseology is introduced to instruct an aircraft to cancel level and procedure speed restrictions, as well as to instruct an aircraft to leave and rejoin a procedure.