The aim of this thesis is to study the temporarily evolution of the fundamentals of law dictated by the Spanish Supreme Court in sentences related with murders between 1979 and 1995. We are going to analyze the data with three different points of view to demonstrate we have statistical evidences to admit the existence of the evolution in the fundamentals of law in these sentences. The different analysis give us some information and each one have positive and negative technical details we are going to discuss in this thesis. Finally, we conclude these differences exist and the fundamentals of law are becoming more procedurals and objectives than years ago, as we expect if we are thinking in the Supreme Court. We suspect these differences exist for generational changes in the judges of the Supreme Court.