A Social Accounting Matrix (SAM) represents a comprehensive, consistent and economy-wide data framework depicting economic flows within an economy as well as between that economy and the rest of the world. The importance of the SAMs stems from their use as main database for the calibration of Computable General Equilibrium (CGE) models. As dynamic CGE models typically simulate long-term policy scenarios, it is important to assess to what extent the base SAM, particularly the technological sub-matrix, remains a valid representation of the economy’s structure over the entire simulation period. We conduct this analysis using a relatively simple approach based on the notion of matrix norm.