For example, the protective measures in the Peruvian Civil Code of 1993 is not the same as those governing the Peruvian Civil Procedure Code 1912, what deserves the corresponding internal microcomparativo study. However, it is necessary to mention that for various legal systems there are similarities and differences that determine certain legal systems are similar to each other, and other legal systems are different from one another, noting that when similar legal systems are grouped in legal families, of which we deal in more detail later. 2. DEFINITION There are several definitions of comparative law as definitions for the same quote and comment on follows: For Martinez Paz comparative law is the discipline that aims, through analytical research and comparative criticism of existing legislation, to discover the fundamental principles and legal institutions to coordinate and present a positive system. He defines law as a discipline and refers to two types of research are the comparative method and the analytical method (which are not the only methods but the most important in the study of comparative law is the comparative method), and refers to the legislation, that is, positive law, ie, that definition gives considerable weight to the law in comparative law, as in studies of comparative law legislation is not the only thing that is studied by that can be studied legal institutions or case, or enforceable legal or custom. No reference to comparative law seeks to find similarities and differences between legal systems. Sola Canizares For comparative law is the scientific comparison of different legal systems or one aspect of themselves and the causes that have occurred and the effects that have resulted in respective social media.