Each item gets a number of points, according to the position in the list of each user. The least favorite item gets 0
points and a point is added each time the next item in the list is considered. If a user gave the same rating to more items, points are distributed. So, for example, items H and I were rated by user u2 with the lowest rating and should “share” the lowest positions with 0 and 1 points, so both the items get (0+1)/2=0.5 points. A group preference is obtained by adding the individual points of an item.