How does the adversarial system decide disputes?
Explain the features of the adversarial system of trial used in Australia and compare it with the inquisitorial system.
Features of Australia's adversarial trial system - party control, an impartial decision-maker, rules of evidence and the standard of proof - and how it differs from the inquisitorial system.
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What this dot point is asking
You must explain the key features of the adversarial system and be able to compare its strengths and weaknesses, often against the inquisitorial system.
Key features of the adversarial system
The adversarial system is built on the idea that the truth is best found through a structured contest between two sides.
- Two opposing parties. In a criminal trial these are the prosecution and the accused; in a civil trial they are the plaintiff and the defendant. Each side controls how it runs its own case.
- An impartial, passive decision-maker. The judge does not investigate or gather evidence. The judge supervises the trial, rules on points of law and ensures fair procedure. Where there is a jury, the jury decides the facts.
- Party control of evidence. Each side decides which witnesses to call, what evidence to lead and how to cross-examine the other side's witnesses.
- Strict rules of evidence and procedure. Rules govern what evidence is admissible (for example, excluding much hearsay) to keep the trial fair.
- Standard and burden of proof. In criminal cases the prosecution must prove guilt beyond reasonable doubt. In civil cases the plaintiff must prove the case on the balance of probabilities.
Strengths of the adversarial system
- Each party can present its case fully, which can promote fairness.
- The decision-maker stays impartial because they do not investigate.
- Rules of evidence protect against unreliable or unfairly obtained material.
- The presumption of innocence and high criminal standard of proof protect the accused.
Weaknesses of the adversarial system
- Outcomes can depend on the skill and resources of each party's lawyers, disadvantaging self-represented or poorly funded litigants.
- It can be slow, costly and stressful.
- Truth can be obscured if a party chooses not to call certain evidence, because the court relies on what the parties present.
The inquisitorial system compared
The inquisitorial system, used in many continental European countries, takes a different approach.
- The judge (or examining magistrate) actively investigates the facts, directs the gathering of evidence and questions witnesses.
- The proceeding is more of an official inquiry into the truth than a contest between parties.
- Rules of evidence are generally more flexible, and pre-trial investigation plays a larger role.
A common comparison point is that the inquisitorial system may reduce reliance on lawyer skill and can be more investigative, but it concentrates more power in the judge and may offer fewer procedural protections like cross-examination.
Reforms and the South Australian context
Australian courts have adopted some features that soften pure adversarialism, such as case management by judges, pre-trial conferences and alternative dispute resolution (mediation and conciliation) to reduce cost and delay. In South Australia, courts encourage settlement and mediation in civil matters before trial. These reforms aim to keep the benefits of the adversarial contest while reducing its cost, delay and inequality, which connects directly to the access to justice issues you study later in the course.
Exam-style practice questions
Practice questions written in the style of SACE Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
2019 SACE Stage 22 marksOutline two roles of the judge in the adversary system of trial.Show worked answer →
Award one mark for each correctly outlined role (two needed).
Impartial umpire. The judge acts as a neutral referee who does not investigate or take sides. They ensure the trial is conducted fairly, that both parties follow the rules of procedure and evidence, and that each side has a fair opportunity to present its case.
Rulings on law and procedure. The judge decides questions of law, rules on whether evidence is admissible, and (in a jury trial) directs the jury on the relevant law before they decide the facts. In a non-jury trial the judge also decides the facts and the outcome, and gives reasons for the decision.
2019 SACE Stage 22 marksExplain one difference between the adversary system and the inquisitorial system during the pre-trial stage of a criminal dispute.Show worked answer →
For two marks, identify one clear difference and explain it.
In the adversary system, the pre-trial investigation is conducted by the parties: the police and prosecution build the case against the accused, while the defence prepares its own case independently. The court plays little role until trial, and the judge does not direct the investigation.
In the inquisitorial system, an investigating judge or magistrate supervises and directs the pre-trial investigation, gathering evidence for and against the accused and compiling a dossier before the matter reaches trial.
The key difference is who controls the gathering of evidence before trial: the opposing parties (adversary) versus a neutral investigating judicial officer (inquisitorial).
2019 SACE Stage 24 marksDiscuss whether or not the role of the judge in the inquisitorial system leads to just outcomes in the resolution of criminal disputes.Show worked answer →
A 4-mark "discuss" needs points on both sides and a brief judgement.
- Arguments that it leads to just outcomes
- An active investigating judge searches for the truth rather than relying on the skill of opposing lawyers, which can reduce the advantage held by a well-resourced party. The judge gathers evidence both for and against the accused, and relaxed rules of evidence mean relevant material is less likely to be excluded on technical grounds.
- Arguments against
- Concentrating investigation and decision-making in one judicial figure can reduce impartiality and the presumption of innocence, since the judge may form an early view. The accused has fewer procedural protections, and there is less of the rigorous testing of evidence that cross-examination provides.
- Judgement
- A balanced response concludes that the inquisitorial judge can promote truth-seeking and equality, but at some cost to the independence and adversarial testing that protect the accused, so justice depends on adequate safeguards.