It is possible to implement various calculations, however for the sake of simplicity we preferred to use one that multiplied the weight of relation type with the strength and also considered the distance from the starting concept, or initial node. Based on this concept map, if a student did not understand the “brain,” ranker form in the ontology editor calculated scores for 10 nodes starting from the node “brain.” The initial weights entered into the ranker form: subgroup = 5, feature = 4, composition = 3, function = 2, cause = 1 and high = 3, medium = 2, low = 1.