(Esto va a en inglés pues está pensada para personas que no leen español) There is a growing lack of understanding of what makes for good legal research. In particular, there is a too much hurry to make legal research look like research in other disciplines (or what lawyers think research in other disciplines looks like). This will be a series of contributions that attempt to clarify the forms and methods of legal research.
1 Three types of questions
A good place to begin, is to consider that legal research can address three types of questions:
1) Causal questions related to the law
2) Interpretive questions related to the law
3) Normative questions related to the law
Traditional legal research, doctrinal research, is "(2)". Here the goal of the researcher is to define what the law is from a set of materials such as statutes, case law and doctrine. All lawyers are familiar with this, but in this day and age, they cannot explain why this is important, and tend to fall into the temptation of using the methods of "(1)" to do "(2)" which is often a mistake.
Socio-legal research is "(1)". Here the emphasis is not in interpreting the law according to statutes, case law and doctrine, but of seeing the law as a part in a causal chain that begins and ends outside the law, so social reality---> law ---> social reality. Causal questions related to law come in two forms: a) what causes the law? b) what does the law cause? For the first one, studies that show how sociological biases influence is judicial decisions are a good example. For the second, studies that show that law reduce or does not reduce criminality are a good example.
Ethical research is "(3)". Here the emphasis is not in showing what the law is, but what the law ought to be in the aspect of values. This must be emphasized. If the values are fixed, then the study is socio-legal in the form of "(2)b)": law should create economic efficiency, we identify what laws cause efficiency and legislate accordingly. This is instrumental rationality: what are the best means to achieve a predetermined aim. In contrast, ethical research tries to find what are the true aims of the law. So the question is should the law pursue economic efficiency? Should it pursue something different, like a notion of corrective justice? How should this idea of corrective justice be specified?
These questions exemplify three realms: (1) the causal, (2) the positive law and (3) the normative
I believe these three realms are largely independent of each other. But in many traditions of legal research these realms are mixed together, or one realm is chosen to dominate the rest.
Consider marxist theory. For an orthodox marxism, the basic structure of society fully determines the superstructure. The social (1) explains the positive law (2). Furthermore, an orthodox marxist does not believe in morality or moralizing. Ethics depends on the structure of society, the modes of production and so forth. So the social (1) explains the ethical (3). For an orthodox marxist history follows certain laws. Capitalism will end due to its internal contradictions and it will be replaced by communism, which will change both law and morality. True science is only about prediction, about when and how capitalism will end, and there is nothing important to be said about the positive law or morality, except explaining how it is caused by the basic structure of society. So (1) dominates (2) and (3).
For an example on the opposite direction, consider Dworkin's theory of law. According to Dworkin, there is no sense of the positive law independent of ethics and morality. For any interpretation of the law, the conventional legal sources (statutes, case law, doctrine) never exhaust the possible interpretations that can be made, and consequently there is a need to think which interpretation is best on an ethical light. Furthermore, when the judge reflects or deliberates, he must abstract away from his social situation in order to find the best interpretation of the law. Maybe judges are prone to bias, but a reflective judge cannot say "I will decide x, because x represents the interest of my social class". The judge must justify the judgment with reasons, which are going to reflect a moral conviction. So (3) dominates (1) and (2).
Any research that is truly legal, that deserves to take place in law faculty, has a strong component of (2). Otherwise, it may be best to carry out the research in a sociology department or a philosophy department. So any position that gives emphasis to (1) or (3) should explain why some interest in legal interpretation is relevant. So for a marxist, he at least has to interpret the law in order to show that it does not predict judicial behavior, and for Dworkin, it must show that the content of the positive law has some relevance for answering the ultimately moral question of what the law should be.
I don't think that the positive law, that is issue "(2)", is ever irrelevant. But this is something that can be debated by academics. What cannot be debated is that people who believe that the positive law is always irrelevant are wrongly situated in a law faculty. Sadly, due to bad theory and the fashionable attitude of being above the law, many lawyers are inclined to believe in this.
Beyond this general division in three types of questions, covering three realms, there are forms of legal research that deserve special mention because they do not easily fit the scheme: law and economics and critical theory. Law and economics tends to be unclear on whether it is predictive or normative, as it uses a notion of rationality to explain and predict behavior, but it only explains behavior that is (in a precise sense) "rational", and it is not considered falsified if people do not behave "rationally". So at times law and economics seems to commend rational behavior implicitly or explicitly (this also holds for rational choice theory and related fields of inquiry). Critical theory does not aim at any of the three realms directly. It is better to say that it aims to debunk, to undermine a social structure in order for a undefined new one to emerge. Consequently, in contrast to the three questions here defined, the role of research in critical theory is negative.