In numerous cases, there are significant differences among the evaluation and presentation rules applied by entities, members of a group, concerning the elaboration of individual financial statements. In their turn, the consolidated financial statements should allow a homogenous representation of the whole, which is made up of entities included within the consolidation perimeter. For this reason, prior to the achievement of accurate consolidation operations, a series of homogeneity re-treatments are necessary in order to remove all differences existing between the accounting rules applied for drawing up individual financial statements and those applicable to consolidated accounts determined by aggregating individual accounts of entities included within the consolidation perimeter.