An Introduction to Legal Reasoning

An Introduction to Legal Reasoning

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by Edward H. Levi, Frederick Schauer

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Originally published in 1949, An Introduction to Legal Reasoning is widely acknowledged as a classic text. As its opening sentence states, “This is an attempt to describe generally the process of legal reasoning in the field of case law and in the interpretation of statutes and of the Constitution.” In elegant and lucid prose, Edward H. Levi does


Originally published in 1949, An Introduction to Legal Reasoning is widely acknowledged as a classic text. As its opening sentence states, “This is an attempt to describe generally the process of legal reasoning in the field of case law and in the interpretation of statutes and of the Constitution.” In elegant and lucid prose, Edward H. Levi does just that in a concise manner, providing an intellectual foundation for generations of students as well as general readers.

For this edition, the book includes a substantial new foreword by leading contemporary legal scholar Frederick Schauer that helpfully places this foundational book into its historical and legal contexts, explaining its continuing value and relevance to understanding the role of analogical reasoning in the law. This volume will continue to be of great value to students of logic, ethics, and political philosophy, as well as to members of the legal profession and everyone concerned with problems of government and jurisprudence.

Editorial Reviews

Judge Charles E. Wyzanski
“A first rate contribution to jurisprudence.”
Roscoe Pound
“Edward H. Levi’s book promises a more real realism and augurs well for the science of law.”
Law Quarterly Review
“Few volumes of such small bulk contain so much matter for thought.”
Judge Jerome N. Frank
"A splendid job, one which soreley needed doing."
Frederick Schauer
An Introduction to Legal Reasoning was when published an important contribution to the distinctively American view of legal argument, legal reasoning, legal decision making, and legal thought. It remains so to this day, and by no means solely for historical reasons.”

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University of Chicago Press
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Second Edition
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5.20(w) x 7.90(h) x 0.40(d)

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An Introduction to Legal Reasoning

By Edward H. Levi

The University of Chicago Press

Copyright © 2013 The University of Chicago
All rights reserved.
ISBN: 978-0-226-08986-7


An Introduction to Legal Reasoning


This is an attempt to describe generally the process of legal reasoning in the field of case law and in the interpretation of statutes and of the Constitution. It is important that the mechanism of legal reasoning should not be concealed by its pretense. The pretense is that the law is a system of known rules applied by a judge; the pretense has long been under attack. In an important sense legal rules are never clear, and, if a rule had to be clear before it could be imposed, society would be impossible. The mechanism accepts the differences of view and ambiguities of words. It provides for the participation of the community in resolving the ambiguity by providing a forum for the discussion of policy in the gap of ambiguity. On serious controversial questions, it makes it possible to take the first step in the direction of what otherwise would be forbidden ends. The mechanism is indispensable to peace in a community.

The basic pattern of legal reasoning is reasoning by example. It is reasoning from case to case. It is a three-step process described by the doctrine of precedent in which a proposition descriptive of the first case is made into a rule of law and then applied to a next similar situation. The steps are these: similarity is seen between cases; next the rule of law inherent in the first case is announced; then the rule of law is made applicable to the second case. This is a method of reasoning necessary for the law, but it has characteristics which under other circumstances might be considered imperfections.

These characteristics become evident if the legal process is approached as though it were a method of applying general rules of law to diverse facts—in short, as though the doctrine of precedent meant that general rules, once properly determined, remained unchanged, and then were applied, albeit imperfectly, in later cases. If this were the doctrine, it would be disturbing to find that the rules change from case to case and are remade with each case. Yet this change in the rules is the indispensable dynamic quality of law. It occurs because the scope of a rule of law, and therefore its meaning, depends upon a determination of what facts will be considered similar to those present when the rule was first announced. The finding of similarity or difference is the key step in the legal process.

The determination of similarity or difference is the function of each judge. Where case law is considered, and there is no statute, he is not bound by the statement of the rule of law made by the prior judge even in the controlling case. The statement is mere dictum, and this means that the judge in the present case may find irrelevant the existence or absence of facts which prior judges thought important. It is not what the prior judge intended that is of any importance; rather it is what the present judge, attempting to see the law as a fairly consistent whole, thinks should be the determining classification. In arriving at his result he will ignore what the past thought important; he will emphasize facts which prior judges would have thought made no difference. It is not alone that he could not see the law through the eyes of another, for he could at least try to do so. It is rather that the doctrine of dictum forces him to make his own decision.

Thus it cannot be said that the legal process is the application of known rules to diverse facts. Yet it is a system of rules; the rules are discovered in the process of determining similarity or difference. But if attention is directed toward the finding of similarity or difference, other peculiarities appear. The problem for the law is: When will it be just to treat different cases as though they were the same? A working legal system must therefore be willing to pick out key similarities and to reason from them to the justice of applying a common classification. The existence of some facts in common brings into play the general rule. If this is really reasoning, then by common standards, thought of in terms of closed systems, it is imperfect unless some overall rule has announced that this common and ascertainable similarity is to be decisive. But no such fixed prior rule exists. It could be suggested that reasoning is not involved at all; that is, that no new insight is arrived at through a comparison of cases. But reasoning appears to be involved; the conclusion is arrived at through a process and was not immediately apparent. It seems better to say there is reasoning, but it is imperfect.

Therefore it appears that the kind of reasoning involved in the legal process is one in which the classification changes as the classification is made. The rules change as the rules are applied. More important, the rules arise out of a process which, while comparing fact situations, creates the rules and then applies them. But this kind of reasoning is open to the charge that it is classifying things as equal when they are somewhat different, justifying the classification by rules made up as the reasoning or classification proceeds. In a sense all reasoning is of this type, but there is an additional requirement which compels the legal process to be this way. Not only do new situations arise, but in addition peoples' wants change. The categories used in the legal process must be left ambiguous in order to permit the infusion of new ideas. And this is true even where legislation or a constitution is involved. The words used by the legislature or the constitutional convention must come to have new meanings. Furthermore, agreement on any other basis would be impossible. In this manner the laws come to express the ideas of the community and even when written in general terms, in statute or constitution, are molded for the specific case.

But attention must be paid to the process. A controversy as to whether the law is certain, unchanging, and expressed in rules, or uncertain, changing, and only a technique for deciding specific cases misses the point. It is both. Nor is it helpful to dispose of the process as a wonderful mystery possibly reflecting a higher law, by which the law can remain the same and yet change. The law forum is the most explicit demonstration of the mechanism required for a moving classification system. The folklore of law may choose to ignore the imperfections in legal reasoning, but the law forum itself has taken care of them.

What does the law forum require? It requires the presentation of competing examples. The forum protects the parties and the community by making sure that the competing analogies are before the court. The rule which will be created arises out of a process in which if different things are to be treated as similar, at least the differences have been urged. In this sense the parties as well as the court participate in the law-making. In this sense, also, lawyers represent more than the litigants.

Reasoning by example in the law is a key to many things. It indicates in part the hold which the law process has over the litigants. They have participated in the law-making. They are bound by something they helped to make. Moreover, the examples or analogies urged by the parties bring into the law the common ideas of the society. The ideas have their day in court, and they will have their day again. This is what makes the hearing fair, rather than any idea that the judge is completely impartial, for of course he cannot be completely so. Moreover, the hearing in a sense compels at least vicarious participation by all the citizens, for the rule which is made, even though ambiguous, will be law as to them.

Reasoning by example shows the decisive role which the common ideas of the society and the distinctions made by experts can have in shaping the law. The movement of common or expert concepts into the law may be followed. The concept is suggested in arguing difference or similarity in a brief, but it wins no approval from the court. The idea achieves standing in the society. It is suggested again to a court. The court this time reinterprets the prior case and in doing so adopts the rejected idea. In subsequent cases, the idea is given further definition and is tied to other ideas which have been accepted by courts. It is now no longer the idea which was commonly held in the society. It becomes modified in subsequent cases. Ideas first rejected but which gradually have won acceptance now push what has become a legal category out of the system or convert it into something which may be its opposite. The process is one in which the ideas of the community and of the social sciences, whether correct or not, as they win acceptance in the community, control legal decisions. Erroneous ideas, of course, have played an enormous part in shaping the law. An idea, adopted by a court, is in a superior position to influence conduct and opinion in the community; judges, after all, are rulers. And the adoption of an idea by a court reflects the power structure in the community. But reasoning by example will operate to change the idea after it has been adopted.

Moreover, reasoning by example brings into focus important similarity and difference in the interpretation of case law, statutes, and the constitution of a nation. There is a striking similarity. It is only folklore which holds that a statute if clearly written can be completely unambiguous and applied as intended to a specific case. Fortunately or otherwise, ambiguity is inevitable in both statute and constitution as well as with case law. Hence reasoning by example operates with all three. But there are important differences. What a court says is dictum, but what a legislature says is a statute. The reference of the reasoning changes. Interpretation of intention when dealing with a statute is the way of describing the attempt to compare cases on the basis of the standard thought to be common at the time the legislation was passed. While this is the attempt, it may not initially accomplish any different result than if the standard of the judge had been explicitly used. Nevertheless, the remarks of the judge are directed toward describing a category set up by the legislature. These remarks are different from ordinary dicta. They set the course of the statute, and later reasoning in subsequent cases is tied to them. As a consequence, courts are less free in applying a statute than in dealing with case law. The current rationale for this is the notion that the legislature has acquiesced by legislative silence in the prior, even though erroneous, interpretation of the court. But the change in reasoning where legislation is concerned seems an inevitable consequence of the division of function between court and legislature, and, paradoxically, a recognition also of the impossibility of determining legislative intent. The impairment of a court's freedom in interpreting legislation is reflected in frequent appeals to the constitution as a necessary justification for overruling cases even though these cases are thought to have interpreted the legislation erroneously.

Under the United States experience, contrary to what has sometimes been believed when a written constitution of a nation is involved, the court has greater freedom than it has with the application of a statute or case law. In case law, when a judge determines what the controlling similarity between the present and prior case is, the case is decided. The judge does not feel free to ignore the results of a great number of cases which he cannot explain under a remade rule. And in interpreting legislation, when the prior interpretation, even though erroneous, is determined after a comparison of facts to cover the case, the case is decided. But this is not true with a constitution. The constitution sets up the conflicting ideals of the community in certain ambiguous categories. These categories bring along with them satellite concepts covering the areas of ambiguity. It is with a set of these satellite concepts that reasoning by example must work. But no satellite concept, no matter how well developed, can prevent the court from shifting its course, not only by realigning cases which impose certain restrictions, but by going beyond realignment back to the over-all ambiguous category written into the document. The constitution, in other words, permits the court to be inconsistent. The freedom is concealed either as a search for the intention of the framers or as a proper understanding of a living instrument, and sometimes as both. But this does not mean that reasoning by example has any less validity in this field.


It may be objected that this analysis of legal reasoning places too much emphasis on the comparison of cases and too little on the legal concepts which are created. It is true that similarity is seen in terms of a word, and inability to find a ready word to express similarity or difference may prevent change in the law. The words which have been found in the past are much spoken of, have acquired a dignity of their own, and to a considerable measure control results. As Judge Cardozo suggested in speaking of metaphors, the word starts out to free thought and ends by enslaving it. The movement of concepts into and out of the law makes the point. If the society has begun to see certain significant similarities or differences, the comparison emerges with a word. When the word is finally accepted, it becomes a legal concept. Its meaning continues to change. But the comparison is not only between the instances which have been included under it and the actual case at hand, but also in terms of hypothetical instances which the word by itself suggests. Thus the connotation of the word for a time has a limiting influence—so much so that the reasoning may even appear to be simply deductive.

But it is not simply deductive. In the long run a circular motion can be seen. The first stage is the creation of the legal concept which is built up as cases are compared. The period is one in which the court fumbles for a phrase. Several phrases may be tried out; the misuse or misunderstanding of words itself may have an effect. The concept sounds like another, and the jump to the second is made. The second stage is the period when the concept is more or less fixed, although reasoning by example continues to classify items inside and out of the concept. The third stage is the breakdown of the concept, as reasoning by example has moved so far ahead as to make it clear that the suggestive influence of the word is no longer desired.

The process is likely to make judges and lawyers uncomfortable. It runs contrary to the pretense of the system. It seems inevitable, therefore, that as matters of kind vanish into matters of degree and then entirely new meanings turn up, there will be the attempt to escape to some overall rule which can be said to have always operated and which will make the reasoning look deductive. The rule will be useless. It will have to operate on a level where it has no meaning. Even when lip service is paid to it, care will be taken to say that it may be too wide or too narrow but that nevertheless it is a good rule. The statement of the rule is roughly analogous to the appeal to the meaning of a statute or of a constitution, but it has less of a function to perform. It is window dressing. Yet it can be very misleading. Particularly when a concept has broken down and reasoning by example is about to build another, textbook writers, well aware of the unreal aspect of old rules, will announce new ones, equally ambiguous and meaningless, forgetting that the legal process does not work with the rule but on a much lower level.

The movement of legal concepts in case law has frequently been shown by pointing to the breakdown of the so-called "inherently dangerous" rule. It is easy to do this because the opinion in MacPherson v. Buick Motor Co. is the work of a judge acutely conscious of the legal process and articulate about it. But MacPherson v. Buick was only a part of a cyclical movement in which differences and similarities first rejected are then adopted and later cast aside. The description of the movement can serve as an example of case law. Roughly the problem has become: the potential liability of a seller of an article which causes injury to a person who did not buy the article from the seller. In recent times the three phases in the movement of the concepts used in handling this problem can be traced.


Excerpted from An Introduction to Legal Reasoning by Edward H. Levi. Copyright © 2013 The University of Chicago. Excerpted by permission of The University of Chicago Press.
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Meet the Author

Edward H. Levi (1911-2000) was attorney general of the United States from 1975 to 1977, president of the University of Chicago, and dean of the University of Chicago Law School.

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Introduction to Legal Reasoning 3 out of 5 based on 0 ratings. 1 reviews.
Anonymous More than 1 year ago
...did I even read this book. On a positive note, my insomnia is cured.