Some materials exhibits a Brittle/Ductile rupture during a test (ex: traction test) one can notice that by examining the shape of the stress/strain curve, some people try to examine the rupture surface via a microscopic observations, the surface's reliefs can be helpfull to find out the main microscopic mechanisms responsible of the final rupture of the considered material, for those who have a significant experiance in this fiels, what are the most imprtant methods ( or steps to take) used to classify the rupture of a studied material to take into account as a sufficient arguments for this classification, and can any one briefly give the steps to take in order to analyze and classify the rupture of the material under study. Cordialy