A method of analysing the effect of an assault on hair, comprising the steps of: (i) collecting imaging data for at least one hair surface, (ii) applying at least one assault to the at least one hair surface, (iii) collecting imaging data for the at least one hair surface arising from step (ii), (iv) converting the imaging data collected at steps (i) and (iii) into a format to create magnified images from a 3D printer, (v) producing magnified 3D models of the at least one hair surface from a 3D printer using the data from step (iv), (vi) comparing the 3D model arising from step (iii) to the 3D model of step (i) and (vii) assessing the degree of damage to the hair. A method of determining the effect of a beneficial treatment or regime on hair comprising the steps of: (i) collecting imaging data for at least one hair surface, (ii) converting the imaging data from step (i) into a format to create magnified images from a 3D printer, (iii) producing magnified 3D model(s) of the at least one hair surface from a 3D printer using the data from step (ii), (iv) analyzing the properties of the hair surface apparent from the 3D model(s), (v) assessing the degree of damage to the hair, (vi) applying a suitable beneficial treatment or regime to the hair, taking into account the findings of steps (iv) and/or (v), (vii) collecting imaging data for the at least one hair surface arising from step (vi) and producing a magnified 3D model of the treated hair surface using the imaging data, (viii) comparing the 3D model arising from step (vii) to the 3D model arising from step (iii) and (ix) assessing the beneficial effect to the hair.La présente invention concerne un procédé d'analyse de l'effet d'une agression sur les cheveux, comprenant les étapes de : (i) collecte de données d'imagerie pour au moins une surface de cheveux, (ii) application d'au moins une agression sur l'au moins une surface de cheveux, (iii) collecte de données d'imagerie pour l'au moins une surface de cheveux obtenu
