The lawyer needs to know that. The roots of the systems that are used in the world to understand that. Why then the law must be provided. What is the concept behind it. The study of law, we see the evolution of law and society in parallel to, because the law is intended to apply in our society is a major rai Social Sciences Branch of one of the. The study of the law, these feeling. Need to understand the nature of each society, each social moment.