Fundamentals

Judicial Review: What It Is, How It Works, and Its Limits

By Daniel Sardá · Published on July 28, 2026

8 min read1,726 words

Judicial review allows courts to determine whether public power has been exercised according to law, but its scope, institutions, and effects vary across legal systems.

A public authority denies a license, Parliament passes a law restricting a freedom, or a court issues a disputed judgment. In all three situations, someone may seek judicial intervention. Yet that intervention does not always serve the same purpose or produce the same result.

In its broadest sense, judicial review is the examination by a court of whether a rule, decision, action, or omission complies with the applicable law. It is a family of mechanisms, not a universal procedure. To understand it, we must ask what is being reviewed, against which legal standard, who decides, and what effect the decision may have.

This caveat matters because the term is used for different institutions. In some contexts, it refers to constitutional review; in others, to review of administrative action. It can also be associated with the review of court judgments. Confusing these mechanisms can lead people to attribute powers to judges that they may not possess or to expect remedies that a particular proceeding cannot provide.

Key idea: Judicial review does not follow a single formula. Its meaning depends on the subject of review, the legal standard, the court with jurisdiction, and the effects authorized by each legal system.

Three Meanings That Should Be Kept Separate

Judicial Review of Constitutionality

Here, a court assesses a statute, regulation, or public act against the Constitution. The central question is whether public power respected a higher legal norm: protected rights, the allocation of powers, procedural requirements, or other constitutional limits.

This form of review expresses the principle of constitutional supremacy. If the Constitution also binds those who legislate and govern, there must be some institutional way to respond when their decisions conflict with it. Judicial review is one such mechanism, although countries organize it in different ways.

In the United States, the 1803 decision in Marbury v. Madison established the federal doctrine that courts may decline to apply a statute incompatible with the Constitution when deciding a case. This does not mean that judicial review originated there or that the American model is universal.

Review of Administrative Action

In this sense, a court examines whether a public authority acted within its powers and followed the rules that bind it. It might review, for example, the denial of a license, a regulatory penalty, or an agency's refusal to perform a legal duty.

The usual question is not whether the judge would have made a better decision, but whether the authority acted lawfully. In England and Wales, for example, administrative judicial review is distinct from an appeal on the correctness or merits of a decision. Depending on the case, a court may quash the act, prohibit an action, or require the authority to fulfill its duty; it often sends the matter back to be decided again according to law.

That distinction preserves two functions at once: it allows courts to check abuses of authority without turning judges into administrators of every public policy.

Procedural Review of Judgments

A judgment may also be examined by another court through an appeal, a review limited to questions of law, or another extraordinary remedy established by statute. Here, the immediate subject of review is an earlier judicial decision, and the scope depends on the remedy: it may encompass questions of law, procedure, and, in some cases, fact.

For this reason, judicial review and appeal are not synonyms. An appeal asks whether a prior decision contained errors reviewable under that form of recourse. Judicial review of administrative action usually asks whether a public body remained within the legal limits governing its decision. Moreover, a procedure called a “review petition” or “motion for review” may be a specific remedy whose content varies by jurisdiction; its name does not define the broader concept.

The Four Questions That Show How It Works

Rather than memorizing labels, it is more useful to analyze any system through four questions:

• What is being reviewed? A statute, an administrative act, a public omission, or a judgment.
• Against what standard? The Constitution, an enabling statute, procedural guarantees, or other applicable rules.
• Who conducts the review? An ordinary court, a specialized tribunal, a supreme court, or a constitutional court.
• With what effect? Non-application in the particular case, general invalidation, remand to the authority, a prohibition, or a mandatory order, among other remedies.

These variables can be combined in many ways. Two countries may both recognize constitutional review while differing over who may initiate it, which court decides, and whom the judgment binds.

The distinction between declining to apply a rule and invalidating it is especially important. Declining to apply a rule means preventing its use to decide a particular dispute. Invalidating it aims to deprive it of legal force to the extent established by the system. We cannot assume that every judge able to find an incompatibility may also remove a rule from the legal order.

Useful distinction: A court's finding that an action is invalid does not necessarily mean that it may replace that action with the decision it prefers. The remedy may be limited to setting the action aside and sending the matter back to the competent authority.

Decentralized, Centralized, and Hybrid Models

Decentralized and centralized models are useful reference points for understanding who exercises constitutional review.

In an ideal decentralized model, multiple courts may examine a constitutional issue while deciding cases within their jurisdiction. Review usually arises incidentally: the validity of a rule must be resolved to decide a specific dispute. The American system is the best-known historical example.

In an ideal centralized model, constitutional decisions are reserved for a specialized body, such as a constitutional court. Depending on the design, an issue may reach that body through a direct action, a referral from another court, or procedures available only to certain institutional actors.

Real systems, however, rarely fit perfectly into either category. Some divide certain powers among ordinary courts while reserving others for a constitutional court. Rules on standing, precedent, time limits, and effects also vary. It is therefore incorrect to assume that every decision under decentralized review affects only the parties or that every ruling by a centralized body removes a rule for everyone.

The most useful comparison is not about declaring one model the winner. It is about examining whether the overall system provides reasonable access, consistent decisions, effective remedies, and clear limits on judicial authority.

Why Does Judicial Review Matter?

Its strongest justification is straightforward: those who exercise public power must also be subject to law. Elections authorize officials to govern, but they do not grant a license to disregard jurisdictional boundaries, procedures, or rights. Judicial review turns this subordination into a practical possibility and reinforces the limits on legislative power.

From a classical liberal perspective, this function is valuable because it protects spheres of individual liberty from majorities and public authorities. A Constitution would be a weak barrier if the people it restrains could decide for themselves when to obey it. An independent court can provide a forum in which an individual challenges the use of public coercion and demands a legal justification.

Yet the mechanism does not guarantee liberty or the rule of law on its own. If access is illusory, judges lack independence, or judgments go unenforced, review may exist on paper while failing in practice. Courts can also make poor decisions: judges interpret texts, assess arguments, and work within human institutions.

Key idea: Limiting political power does not require transferring unlimited power to the courts. It requires defined authority, independence, and public reasons that can be examined and criticized.

Deference, Legitimacy, and the Risk of Government by Judges

The democratic objection deserves a serious answer. When unelected judges invalidate decisions made by elected representatives, they can alter policies supported by a majority. The problem becomes more visible when courts apply open-ended constitutional clauses or when case law appears to depend on political preferences.

The answer cannot be that judges are neutral by definition. Their legitimacy depends on institutional limits: jurisdiction established in advance, adversarial procedures, publicly reasoned decisions, respect for applicable precedent, and avenues of correction permitted by the system itself. Public reason matters because a coercive decision must be justified through accessible arguments, not the personal will of the person judging.

Judicial deference recognizes that administrators and legislators have legitimate spheres of decision-making, especially when the law entrusts them with technical or policy choices. But deference should not become automatic obedience. If a court accepts any explanation, review ceases to check legality; if it replaces every judgment made by another institution with its own, it erases the division of functions.

The balance depends on context. The more severely a decision affects rights, the more convincing the government's public justification should be. The more clearly the law delegates a technical choice within reasonable limits, the greater the authority's margin may be. No single intensity of review is optimal for every case.

Nor can politicization be eliminated by a single rule. Appointment procedures, security of tenure, transparency, and a culture of legal reasoning can reduce the risks. Judicial independence must therefore be accompanied by institutional accountability.

How to Interpret the Term in Context

When a news report, judgment, or statute mentions “judicial review,” do not assume what it means. First identify the country and the procedure. Then ask:

Is a statute being challenged under the Constitution, an administrative action under ordinary law, or a judgment through an appeal or other remedy? Can the court review the merits, or only the way the decision was made? Can it invalidate the rule, decline to apply it in that case, or send the matter back? Does its ruling bind only the parties, or does it have broader effect?

Answering these questions prevents two opposite mistakes: imagining that any judge can invalidate any public decision, or believing that a court is powerless because it cannot directly replace that decision.

Judicial review occupies a delicate place in constitutional government. It enables an individual to confront power with a legal norm and an argument, but its value does not lie in granting the final word to infallible human beings. It lies in preventing public authorities from having the only word on the limits of their own power. At its best, judicial review combines effective oversight, bounded authority, and decisions that must be justified to the public.