Polycrystalline materials have several significant length scales, and their macroscopic behavior is generally controlled by their behavior at the micro-scopic level. On the microscopic scale, polycrystalline materials cannot be considered homogeneous and isotropic, since microstructures present local variations in their properties. In this work, the dependence of microstructural effects on macrostructural behavior will be studied. The objective is to study some techniques for measuring strain at different scales and prove that macrostructural strains reflect the average of microstructural strains. For this, the functioning and application of the Digital Image Correlation (DIC) technique will be verified, which compares a subset of an image of a mate-rial surface before and after a deformation to measure the displacement field. deformations and strains, as well as extensometry, which measures the deformation of a point in the material through the variation of electrical resistance of a small wire glued to its surface. Through the analysis of pre-existing experimental strain data from DIC and extensometry, the differ-ences between the macro and microstructural strains and the relationships between the different length scales will be observed. For the development of the work, research will be carried out on classical and current techniques for measuring strains, such as extensometry capable of providing macro-scopic mean values of strains and the digital correlation of images capable of providing field measurements of strains in varied scales. These tech-niques make it possible to study the macroscopic behavior of the material and its dependence on local microstructures. From the analysis of the ex-perimental data obtained previously, it will prove that the microstructural de-formations are very heterogeneous, that they do not have the same proper-ties throughout their extension, with grain boundaries acting as deformation concentrators. Thus, the initiation of fatigue cracks can be observed in the grain boundaries and creep deformations will preferentially accumulate in them.