That theory and practice are intrinsically related is not a new argument, neither in general legal studies3 nor in the theory of international law.4 Yet, the relationship of theory and practice in the law is difficult to write about, for it is precisely this relationship, which is a watershed mark between sometimes diametrically different conceptions of the law. Instead of a comprehensive introduction to this topic, for which one would have to study the history of legal thought in extenso, I will constrain myself to a few remarks that illustrate the way of analysis that I will follow in the book.
1.1.1 Performativity of Theory
Theory is the continuous search for answers to persisting questions. How should law be applied? How do we determine the sources of the law? What is the relationship of one legal rule to another? What are the rules of interpretation? What is the purpose of law in a society? How does law relate to other sources of societal normativity, like ethics or etiquette? In this non-exhaustive list, every question consists of many sub-questions. All of them, however, have one thing in common: released from the constraints of concrete cases, they are abstract conceptions on what law is and what it should be.
Law is not a physical but a cognitive object. An abstract view of the law is thus fundamentally different from an abstract conception of an apple. While our thoughts on apple trees, the process of growing, or the inner organic structure of the fruit leave the physical appearance of the apple unchanged, theoretical beliefs about the law decide what the law is. As a social practice, law is what a certain group of people treat as part of this practice.
Immanuel Kant expressed this relation in terms of theory and practice. He argued that ā[a] collection of rules, even of practical rules, is termed a theory if the rules concerned are envisaged as principles of a fairly general nature, and if they are abstracted from numerous conditions, which, nonetheless, influence their practical application. Conversely, not all activities are called practice, but only those realizations of a particular purpose which are considered to comply with certain generally conceived principles of procedure.ā5 The generally conceived principles of procedure, in this picture, are those principles that we believe are common to a practice of law.
Like the Hartian rule of recognition, these principles define the sources of law.6 They may include black letter, but they may also acknowledge custom. They may deal with rules, but they may also promote soft law. As there is no general and unanimous view on what law is, these principles of procedure that define the law are indeterminate. In some areas, they may be more disputed than in others (global law is such an example), but in all areas, they are subject to theoretical discussions. Views on what the law is impact our understanding of practice because they make themselves a background condition of understanding the law: they define what law is in the first place.
Theory does not only impact our view of what law is. More fundamentally, it determines how we do law by providing the daily toolkit for legal interpretation (āthe rules of the gameā).7 Elsewhere, I have described this methodological basis as a legal grammarāthe conceptual and linguistic foundation on which legal decisions restālawās meta-structure, its argumentative techniques, and its systematicity.8 This methodological element is pervasive throughout theoretical approaches, even though we rarely find open commitments to this influence. Ronald Dworkinās interpretivism is a notable exception,9 where other approaches prefer to conceal their methodological aspirations in analytic terms. Yet, giving answers to the questions of what law is and what we should do with it shapes those principles that define and produce our perception of the legal performance.
Theory appears here as a frame of justification against which legal practice is evaluated. As any other form of normative order,10 theory contains assumptions on the justification of social rules, norms, and institutions. As Rainer Forst and Klaus Günther have noted, normative orders provide the basis for political authority, distributory patterns, and individual freedom.11 Such orders presuppose and generate justifications in a continuous process of interaction between normativity and social world. A social practice is oriented on narratives of justification that provide its conceptual background.12 These narratives may be the result of contingent historical constellations, but as they are collectively memorized, they become an institutional basis for the social practice.
The impact of theory is pervasive even in frameworks that are usually considered non-theoretical. For example, the method of legal positivism attributes a high value to the concept of legal validity as the distinction between lege lata and lege ferenda. Thus, it is frequently depicted as a method āagainst theory.ā In a positivistās paradigm, theory should be little more than creative writing. Theoretical views can be used to influence processes of legislation, but they should not inform legal judgments before they are incorporated in the body of positive law. In particular, the normative distinction between theory and practice holds true for legal officials. As Jeremy Waldron notes, the rule of law āis the principle that an official should enforce the law even when it is in his confident opinion unjust, morally wrong, or misguided as a matter of policy.ā13 The official is not supposed to make own theoretical assumptions of a part of the practice. Rather, officials should engage in a mechanical application of the law to a given social world.
Cass Sunstein has illustrated that even in a strictly positivist framework that puts utmost importance on the isolation of law from theory, the theoretical influence is inevitable. Practice translates rules into decisions, and this process of translation requires theoretical views. The most precise account of rules contains abstract concepts and definitions. Even in simple cases, there are always open questions on how to put these concepts into practice. āA legal system must answer this [ā¦] by reference to something ā and that something must be a conception of autonomy, or utility, or efficiency, or welfare, or something else. Even mundane areas of the law of contracts are therefore ...