nˈæstɑːɹ jˈuːsᵻz ðə pɹˈɪnsɪpəl ʌv tˈaɪm pɚsˈɛntɪdʒᵻz tə kˈælɪbɹˌeɪt ɐ skˈiːɚz ɐbˈɪləɾi, ɐ kˈɑːnsɛpt paɪənˈɪɹd baɪ fɹˈænsᵻz ɪkˈoʊl də skˈiː nˈæʃəneɪl tʃˈæmwɑː pɹˈoʊɡɹæm.
NASTAR uses the principle of time percentages to calibrate a skier's ability, a concept pioneered by France's Ecole de Ski Nationale Chamois program.