ITRAThe International Trail Running Association (ITRA) represents all parties involved in trail running (i.e., runners and race organizers). More Points are awarded for finishing a race. Each person who finishes a particular race receives the same number of points (from 1 to 6). The number of points for a particular race depends on the difficulty of that race. For each race, a km-effort score is calculated. Based on this number, ITRA ranks each race with points ranging from 0 to 6.
Reference: ITRA.RUN (click here) – retrieved Sep 2021, English version.