A method, and associated computer system and computer program product, for computing a value between two concepts in a schema containing concepts which are linked to each other through associations. In a schema S of n concepts C1, C2 . . . Ci . . . Cn, the concepts are linked by associations, each association having a semantic distance set in a range between a minimum and a maximum indicating the concepts are completely similar or dissimilar respectively. An information value is determined between concepts from their semantic distance and informational distance. For dissimilar concepts, the informational distance is computed according to a closeness of the concepts. For similar concepts, the informational distance is computed according to a remoteness of the concepts. Both the first and second functions increase with a number of links between C1 and another concept. The number of links is a topological distance between C1 and the other concept.