Legal Theory Lexicon 116: Civil Procedure Theory

Many first-year law students experience civil procedure as a bewildering mass of complex and technical rules. There are rules about pleading, jurisdiction, joinder, discovery, summary judgment, and preclusion—and the rules have exceptions, and the exceptions have their own exceptions. It is easy to feel lost. But a student who sees only the rules is missing the forest for the trees.

Once you take a step back from the individual rules and look at the course as a whole, you gain access to a crucial insight: Civil procedure is a course about big questions. What is law? What makes a procedure fair? Why is the law in action so often different from the law on the books? These questions aren’t distractions or detours—they are the heart and soul of civil procedure. The case that anchors many procedure courses, Erie Railroad v. Tompkins, turns out to rest on a contested view about the very nature of law. Interpretation of the Due Process Clauses of the Fifth and Fourteenth Amendment raise deep questions about procedural fairness. And the gap between the rules as written and the way litigation actually unfolds illuminates the core legal realist insight that the law in action may be very different than the law on the books.

When these themes come into view, your experience of civil procedure can be transformed. The technical rules become the surface of something deeper, and the connections between procedure and the rest of legal theory come into view. Approached in this way, civil procedure can become the most exciting course in the first-year curriculum.

This entry introduces the major theoretical themes of civil procedure. As always, the Lexicon is aimed at law students, especially first year law students, with an interest in legal theory.

Two Models of Civil Procedure Pedagogy

There is more than one way to teach civil procedure, and the differences are not merely matters of style. They reflect different views about what the course is fundamentally about. It is useful to distinguish two models and the theoretical assumptions that ground them.

The first model descends from the legal process school associated with Henry Hart, Albert Sacks, and their colleagues at Harvard in the middle of the twentieth century, and its application to procedure is associated especially with Benjamin Kaplan, one of the principal architects of the modern Federal Rules. The legal process school approached law as a system of institutions, each with its own competence, and it emphasized the importance of reasoned justification for legal decisions. (See Legal Theory Lexicon 082: Reasoned Elaboration.) On this model, the procedure course is organized around the deep structural questions of the litigation system: how authority is allocated between state and federal courts, what role each institution is competent to play, and what justifies the exercise of judicial power. The case of Erie Railroad v. Tompkins becomes the heart of the course, because Erie raises these structural questions in their most fundamental form.

The second model is sometimes associated with the approach developed at the University of Wisconsin, and it reflects the “law in action” tradition in American legal thought. On this model, the course is organized around how lawsuits actually work. It begins with pleading and follows the litigation as it unfolds—through discovery, motion practice, trial, and judgment. The animating questions are practical and empirical: What actually happens when a party files a complaint? How do cases really get resolved? Here the emphasis falls less on the grand structural questions and more on the way that the litigation process works in practice.

Most actual courses combine elements of both the Harvard legal process model and the Wisconsin model. First year law students who take a course that closely adheres to the Wisconsin model may learn more about the ways in which civil procedure shapes the law in action and less about what the Erie Doctrine has to say about the nature of law and the allocation of authority between state and federal courts. And vice versa! Many first year courses combine elements of both approaches. And your civil procedure professor may not even be aware of the history of the civil procedure course and the relationship of that history to the deep theoretical questions that underlie the technical details of procedural doctrines.

Enough history. Let’s dig into civil procedure theory. We can start with Erie Railroad v. Tompkins!

Erie and Two Foundational Questions

Some of you will be reading this Lexicon entry before you have read Erie, while others will have read the case but may still be unsure about what Erie was actually about. Of course, there is no single answer to that question: Erie is about many things. But among those issues are two deep questions, one about the nature of law itself and the other about the distinction between substance and procedure.

What Is Law?

Before Erie Railroad v. Tompkins, federal courts hearing state-law disputes followed the rule of Swift v. Tyson: on questions of “general” common law, a federal court could exercise its own independent judgment about what the law was, rather than following the decisions of the state’s courts. Justice Holmes attacked this practice in a famous dissent, and the ground of his attack was a theory about the nature of law itself. “The common law,” he wrote, “is not a brooding omnipresence in the sky, but the articulate voice of some sovereign or quasi sovereign that can be identified.” Southern Pacific Co. v. Jensen, 244 U.S. 205, 222 (1917) (Holmes, J., dissenting). The phrase “the articulate voice of some sovereign” is a compact statement of the sovereign-command theory of law associated with John Austin: law is the command of a sovereign backed by a threat of punishment, and there is no law without an identifiable sovereign source. On this view, the question “what is the law?” can never be answered by appeal to principles floating free of any lawmaker; one must always be able to identify the sovereign. If the general common law is not the law of a particular state (state common law) or law created by the national government (federal common law), then it really isn’t law at all!

Behind this disagreement lie two pictures of what judges do when they decide common-law cases, and they line up with two great traditions in legal philosophy. On the discovery picture, the common law is a body of principles that exists independently of any court’s decisions, and the judge’s task is to discover and declare what that law already is; this picture fits comfortably with natural law theory, which holds that there is law to be found that does not depend on any human lawmaker. On the interstitial legislation picture, judges do not find pre-existing law but make it, filling the gaps left by other lawmakers; this picture fits with legal positivism, which holds that all law traces to some human source. Swift presupposed the discovery picture: it allowed a federal court to find the “general” common law on the assumption that general common law exists apart from the decisions of any particular state. When the Court overruled Swift in Erie, declaring that “there is no federal general common law,” it rejected the discovery picture and embraced the view that the common law is always the law of some identifiable sovereign (e.g. the law of a particular state). (See Legal Theory Lexicon 093: Common Law.) These alignments are natural but not strict—a natural lawyer can allow a role for interstitial judicial lawmaking, and a positivist can accept that common-law rules grow out of custom and social practice.

The dispute behind Erie is therefore a striking example of how a question in general jurisprudence can be decisive in an actual case. Whether law is discovered or made, and whether it must always trace to a particular sovereign, are among the questions in the debate between natural law theory and legal positivism. Just to be clear, the sovereign command theory that Holmes invoked in his famous “brooding omnipresence” aphorism is not state of the art legal positivism today. (See Legal Theory Lexicon 065: The Nature of Law.)

What Is Procedure?

Erie, which raises the question “what is law?”, also raises a second foundational question: what is procedure? Different civil procedure courses handle this question very differently. Some omit Erie entirely; others devote a single day to the Erie doctrine and move on. But another approach treats the whole Erie canon—Erie itself, Guaranty Trust Co. v. York, Byrd v. Blue Ridge Rural Electric Cooperative, Hanna v. Plumer, Shady Grove Orthopedic Associates v. Allstate Insurance Co., and others—as central to the course. These cases all grow out of a single practical problem: when a federal court hears a state-law claim, it must apply state substantive law but may apply its own procedural rules, and so it must decide which rules are which. In working through that problem, the cases confront a question that turns out to be surprisingly deep: what makes a rule procedural rather than substantive, and how is procedure to be distinguished from substance at all?

At first the distinction seems easy. We feel sure that torts, contracts, and property are matters of substance, and that pleading, jurisdiction, joinder, and discovery are matters of procedure. But the confident intuition breaks down under pressure, and there are two ways to respond. The first view holds that there is no real line to be drawn—that the distinction between substance and procedure is, as Linda Mullenix has argued, inherently unresolvable, so that calling a rule “procedural” is ultimately just a label for rules we choose to treat that way. The second view holds that there is a genuine distinction, but that it is more complex than the easy intuition suggests, because substance and procedure are entangled: a single rule can do substantive and procedural work at the same time, shaping primary conduct even as it governs the conduct of litigation. On this second view, the difficulty of drawing the line reflects not the absence of a distinction but the way substantive and procedural functions are interwoven in actual legal rules. If you are interested in these questions, my own views are presented in Lawrence B. Solum, Procedural Justice, 78 S. Cal. L. Rev. 181 (2004).

Procedural Justice: What Makes a Procedure Fair?

The second great theme of civil procedure is procedural justice: the question of what makes a dispute-resolution procedure fair. Procedural due process is the constitutional basis for limits on personal jurisdiction, and the topic also arises in connection with requirements for notice and an opportunity to be heard. This topic is covered in more depth in a separate Lexicon entry. See Legal Theory Lexicon 023: Procedural Justice.

One way to understand theories of procedural justice is via three models, the first of which is the accuracy model. On this view, the point of a civil procedure is to reach correct outcomes—to apply the law correctly to the true facts. A procedure is fair to the extent that it is accurate, and unfair to the extent that it produces erroneous results. Accuracy is plainly one thing we want from a procedure, but it cannot be the whole story, because perfect accuracy might cost so much that it would make no sense to pay the price. A system that spent a decade and a fortune on every parking ticket might approach 100% accuracy, but imposing those costs on litigants hardly seems fair.

The second approach to procedural fairness is the balancing model. On this view, procedural fairness requires a sensible tradeoff between the benefits of accuracy and the costs of achieving it. The Supreme Court adopted a version of this approach in Mathews v. Eldridge, 424 U.S. 319 (1976), which asks courts to weigh the private interest at stake, the risk of an erroneous deprivation under existing procedures, and the government’s interest, including the burden that additional procedures would impose. The balancing model captures something the accuracy model misses: procedures cost money and time, and a fair procedure must take those costs into account. But it too may be incomplete, because it treats fairness as entirely a matter of costs and benefits.

The third is the participation model. On this view, a procedure is fair only if those who will be bound by its outcome have had a meaningful opportunity to participate—notice of the proceeding and a chance to be heard. The principle is vividly illustrated by Hansberry v. Lee, 311 U.S. 32 (1940), which held that a person cannot constitutionally be bound by a judgment in litigation to which he was not a party and in which his interests were not adequately represented. What is striking about this principle is that it does not seem to reduce to accuracy or to cost. A person denied the chance to participate has a complaint even if the outcome happens to be correct and even if giving him a hearing would have been expensive. The value of participation appears to be, at least in part, independent of the values captured by the first two models—a point that suggests procedural fairness is not simply a matter of getting good outcomes at a reasonable price.

Law in Action and Law on the Books

A third theme of civil procedure is the gap between the law on the books and the law in action—between the rules as written and the way litigation actually unfolds. This distinction is a central preoccupation of the empirical and realist tradition in procedural thought, and it is one of the places where the study of procedure connects to the social reality of the legal system. The rules of civil procedure are not self-executing. How they operate depends on the costs of litigation, the incentives of the parties, and the practical dynamics of the litigation process—and those forces can pull the law in action away from what the rules on their face appear to require.

Pleading is a good example. Before the Supreme Court’s decisions in Bell Atlantic Corp. v. Twombly, 550 U.S. 544 (2007), and Ashcroft v. Iqbal, 556 U.S. 662 (2009), a claim that discovery would eventually have shown to be groundless could nonetheless succeed in practice. The reason was a cost asymmetry: because defending against discovery is often far more expensive than pursuing it, a defendant might rationally settle even a meritless claim rather than bear the cost of defeating it. A claim the law on the books called meritless could prevail in the law in action. Twombly and Iqbal were in part a response to this problem. By raising the pleading standard—requiring a complaint to state a claim that is “plausible” on the facts alleged—the Court sought to screen out groundless claims before the expensive machinery of discovery is set in motion. But the response generates a problem of its own. Because plausibility is judged on the facts a plaintiff has been able to plead, and because some meritorious claims rest on facts that can be obtained only through discovery—which now comes too late—the new regime can defeat valid claims at the pleading stage. A claim the law on the books treats as fully valid can be destroyed in the law in action.

The pleading example points to a more general lesson. Procedural rules are not merely the neutral infrastructure of the litigation system; they shape which claims succeed and which fail, and in doing so they change the incentives that govern conduct in the world—whether a firm risks anticompetitive behavior, or whether an injured plaintiff can hope to vindicate a claim. A rule that is procedural in form can be substantive in effect. This is the practical face of a point encountered earlier in the discussion of Erie: substance and procedure are entangled. There the entanglement was a conceptual difficulty about how to classify rules; here it is an observable fact about how procedural rules reach out and govern primary conduct.

Interpretation: Constitutional, Statutory, and Rules

Civil procedure differs from torts, contracts, and property in a way that is easy to overlook. The substantive common-law subjects are built largely from judicial decisions; their law lives in the caselaw. Procedural law, by contrast, dwells in authoritative texts—the Due Process Clauses of the Constitution, jurisdictional and procedural statutes enacted by Congress, and the Federal Rules of Civil Procedure. Because procedure is governed by texts of three different kinds, the civil procedure course is the first place many law students encounter theories of interpretation and their application to different kinds of legal texts.

Consider constitutional interpretation. The law of personal jurisdiction is built on the Due Process Clause, and its history is a case study in competing approaches to constitutional meaning. The early law, exemplified by Pennoyer v. Neff, 95 U.S. 714 (1878), was formal and rule-like: jurisdiction turned on the physical presence of the defendant or his property within the state’s territory. That formalism gave way in International Shoe Co. v. Washington, 326 U.S. 310 (1945), which reframed the question in terms of whether requiring the defendant to litigate in the forum comports with “traditional notions of fair play and substantial justice.” International Shoe is often read as an example of living constitutionalism: the Court interprets the open-ended language of the Due Process Clause by appeal to evolving constitutional values, here the value of fairness. But fairness is not the only way to read the clause. Justice Black, concurring, objected that the Constitution leaves each state the power to open its courts to suits against corporations doing business there, and that conditioning that power on the Court’s notion of “fair play” was itself a judicial deprivation. On Black’s view, the question is not whether a state’s assertion of jurisdiction strikes the Justices as fair, but whether the state has acted within its lawful authority—an approach that locates the meaning of due process in the positive law rather than in the Court’s evolving sense of fairness, and that has affinities with later originalist readings of the clause. Justice Black understood the original meaning of the Due Process of Law Clauses to require the process that is due as a matter of positive law—the legal procedures actually in force at the time of the deprivation. The disagreement is not really about personal jurisdiction at all; it is about how to interpret a constitutional provision.

Statutory interpretation enters the course through the jurisdictional statutes. A good illustration is the supplemental jurisdiction statute, 28 U.S.C. § 1367, and the Supreme Court’s divided interpretation of it in Exxon Mobil Corp. v. Allapattah Services, Inc., 545 U.S. 546 (2005). Writing for the majority, Justice Kennedy read the statute by its plain text: because the language unambiguously authorized supplemental jurisdiction over the claims at issue, there was no need to consult the statute’s legislative history, and little reason to trust it even if consulted. Justice Ginsburg, in dissent, read the statute against the background of the settled jurisdictional rules that preceded it, arguing that Congress had given no clear signal that it meant to discard a long-established limit. The split between them provides an illustration of the great divide in statutory interpretation—between a textualism that begins and ends with the enacted words in context and an approach that reads those words in light of statutory purpose and prior understandings. (See Legal Theory Lexicon 078: Theories of Statutory Interpretation and Construction.)

Finally, the Federal Rules raise an interpretive problem of their own, distinct from both constitutional and statutory interpretation. The Rules are not statutes: they are promulgated through a rulemaking process under the Rules Enabling Act, drafted by an Advisory Committee whose notes are an unusually authoritative guide to their meaning. This gives rise to a question with no exact counterpart elsewhere. When the Court concludes that a Rule is producing undesirable results, it has a choice: it can set in motion the formal process of amending the Rule, or it can reinterpret the existing Rule to mean something new. Twombly and Iqbal are again instructive. The plausibility standard those cases announced is widely understood to have changed or even negated the meaning of Rule 8’s requirement of “a short and plain statement of the claim,” and it did so through interpretation rather than through the amendment process—a result that looks more purposivist than textualist, and that raises the question whether reform of the Rules should proceed through reinterpretation or through the channels the Rules Enabling Act provides. Because the Rules occupy a middle ground between statute and judicial doctrine, the theory of how they should be interpreted remains genuinely unsettled.

Conclusion: The Theoretical Stakes of a Doctrinal Course

The rules of civil procedure can be learned as a body of technical doctrine, and for many purposes they must be. But beneath the doctrine lie some of the deepest questions in legal theory. The debate behind Erie is a debate about the nature of law and about what separates substance from procedure. The law of due process raises the question of what makes a procedure fair. The gap between the law on the books and the law in action reveals that procedural rules do not merely process disputes but shape the conduct they govern. And the interpretation of the constitutional, statutory, and rule-based texts of procedure requires the student to confront, often for the first time, the competing theories of how legal texts should be read. In each case, what looks like a settled technical rule turns out to rest on a contested theoretical foundation.

This theoretical depth was one of the reasons that the legal process tradition saw civil procedure as the theoretical core of the first year curriculum, and it is why that tradition placed cases like Erie at the center of the course. The stage-by-stage, law-in-action approach associated with the Wisconsin model of the course has its own great virtues, and most courses draw on both models. But a student who sees only the stages and the rules will miss what makes the subject genuinely deep. Civil procedure is not merely the plumbing of the legal system; it is a sustained encounter with the fundamental questions of legal theory, encountered in the concrete and consequential setting of a lawsuit. Approached with that in mind, it can be the most exciting course in the first-year curriculum.

Related Entries

Bibliography

Robert G. Bone, Agreeing to Fair Process: The Problem with Contractarian Theories of Procedural Fairness, 83 B.U. L. Rev. 485 (2003).

Max Crema & Lawrence B. Solum, The Original Meaning of “Due Process of Law” in the Fifth Amendment, 108 Va. L. Rev. 447 (2022).

William N. Eskridge, Jr., Dynamic Statutory Interpretation (1994).

Lon L. Fuller, The Forms and Limits of Adjudication, 92 Harv. L. Rev. 353 (1978).

Benjamin Kaplan, Continuing Work of the Civil Committee: 1966 Amendments of the Federal Rules of Civil Procedure (I), 81 Harv. L. Rev. 356 (1967).

Jerry L. Mashaw, The Supreme Court’s Due Process Calculus for Administrative Adjudication in Mathews v. Eldridge: Three Factors in Search of a Theory of Value, 44 U. Chi. L. Rev. 28 (1976).

Linda S. Mullenix, The Constitutionality of the Proposed Rule 23 Class Action Amendments, 39 Ariz. L. Rev. 615 (1997).

Roscoe Pound, Law in Books and Law in Action, 44 Am. L. Rev. 12 (1910).

Lawrence B. Solum, Procedural Justice, 78 S. Cal. L. Rev. 181 (2004).

Lawrence B. Solum & Max Crema, Originalism and Personal Jurisdiction: Several Questions and a Few Answers, 73 Ala. L. Rev. 483 (2022).

Created: June 21, 2026

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Legal Theory Lexicon 116: Civil Procedure Theory

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