📚 AS AQA Law: Formula and Theorem Quick Reference Manual | AS AQA 法律：公式定理速查手册
The AS AQA Law course often requires students to apply legal ‘formulas’—structured rules and tests that determine liability. This quick reference manual simplifies complex legal principles into memorable equations and flowcharts for criminal law and tort law. Use these formulas to check whether the elements of an offence or tort are satisfied, just as you would in an exam problem question.
AS AQA 法律课程常要求学生运用法律“公式”——即决定责任的结构化规则与测试。本速查手册将复杂的法律原则简化为易于记忆的方程和流程图，涵盖刑法与侵权法。像应对考试情景题那样，使用这些公式来检验犯罪或侵权要件是否满足。
1. Criminal Liability Equation | 刑事责任等式
The universal starting point for any criminal offence. Unless the question concerns a strict liability crime, you must prove both the actus reus (guilty act) and mens rea (guilty mind), and then consider whether a valid defence applies.
任何刑事犯罪的通用起点。除非涉及严格责任罪行，否则必须证明犯罪行为 (actus reus) 与犯罪意图 (mens rea)，继而考虑是否存在有效辩护。
Actus Reus + Mens Rea – Valid Defence = Criminal Liability
犯罪行为 + 犯罪意图 – 有效辩护 = 刑事责任
Actus reus can consist of an act, an omission (where a duty exists), or a state of affairs. Mens rea varies by offence and includes intention, recklessness, negligence, or knowledge. The prosecution must prove both elements beyond reasonable doubt, and the defendant may escape liability by raising a full defence such as self-defence or insanity.
犯罪行为可由作为、不作为（存在义务时）或状态构成。犯罪意图因罪行而异，包括故意、轻率、疏忽或明知。控方须在排除合理怀疑后证明两要素；被告可通过提出完全辩护（如自卫或精神错乱）免除责任。
2. Mens Rea Cheat Sheet | 犯罪意图速查表
Mens rea is the mental element required for a particular crime. Different offences demand different levels of fault. Use the table below to identify the required mens rea for common AS-level offences.
犯罪意图是特定罪行所要求的主观意图。不同罪行要求不同过错程度。使用下表识别AS阶段常见罪行的意图要求。
| Offence | Required Mens Rea |
| Murder | Intention to kill or cause GBH |
| Voluntary Manslaughter | As for murder, but a partial defence applies |
| Assault | Intention or recklessness as to causing apprehension of immediate unlawful force |
| Battery | Intention or recklessness as to applying unlawful force |
| s.47 ABH | Intention or recklessness as to assault or battery (no need to intend ABH) |
| s.20 GBH | Intention or recklessness as to some harm (interpreted as Cunningham recklessness) |
| s.18 GBH with Intent | Specific intent to cause GBH or intent to resist/prevent arrest |
| Theft | Dishonesty and intention to permanently deprive |
When using the table, remember that recklessness for non-fatal offences is subjective (Cunningham): the defendant must have foreseen the risk of the prohibited consequence and gone on to take it unreasonably. For criminal damage, recklessness may be assessed under the objective test in R v G.
使用该表时，注意非致命罪行中的轻率采用主观标准 (Cunningham)：被告必须预见到禁止后果的风险，并且不合理地甘冒该风险。对于刑事毁坏，轻率可能采用 R v G 案中的客观标准。
3. Causation Formula | 因果关系公式
For result crimes (e.g., murder, manslaughter, s.47 ABH) the prosecution must prove that the defendant’s actus reus caused the prohibited consequence. The law uses a two-stage test.
对于结果犯（如谋杀、误杀、s.47实际身体伤害），控方必须证明被告的行为引起了禁止后果。法律采用两阶段检验法。
Factual Causation (‘But For’ Test) + Legal Causation (Substantial and Operating Cause) = Causation Established
事实因果关系（“若非”检验） + 法律因果关系（实质且有效原因） = 因果关系成立
Factual causation: ask ‘but for the defendant’s conduct, would the result have occurred?’ If the answer is ‘no’, factual causation is satisfied (R v White). Legal causation requires the defendant’s act to be a substantial (more than minimal) and operating cause of the result. In R v Smith the defendant’s stabbing was still an operating cause despite poor medical treatment, because the original wound remained a substantial factor.
事实因果关系：问“若非被告的行为，结果是否会发生？”若答案为“否”，则事实因果关系成立（R v White）。法律因果关系要求被告的行为是结果的实质（超出微量）且有效的原因。在 R v Smith 案中，尽管医疗处理不佳，被告的捅刺仍是有效原因，因为原始伤口仍然是实质因素。
An intervening act (novus actus interveniens) can break the chain of causation, but only if it is free, voluntary and informed (R v Kennedy), or an unforeseeable natural event. Medical negligence rarely breaks the chain unless ‘palpably wrong’ and independent of the original injury (R v Cheshire). The victim’s own acts (e.g., refusing treatment) do not necessarily break the chain; you must assess whether the injury remained an operative and significant cause.
介入行为（新介入行为）可打断因果关系链，但仅限于该行为是自由、自愿且知情的（R v Kennedy），或属于不可预见的自然事件。医疗过失极少打断因果关系链，除非“明显错误”且独立于原始伤害（R v Cheshire）。受害人自身行为（如拒绝治疗）不一定打断链条；需评估伤害是否仍为有效且显著的原因。
4. Strict Liability Formula | 严格责任等式
Strict liability offences do not require proof of mens rea for at least one element of the actus reus. They are usually regulatory or public safety crimes. The prosecution only needs to show the defendant performed the prohibited act.
严格责任罪行不要求证明犯罪行为中至少一个要素的犯罪意图。它们通常属于监管或公共安全犯罪。控方仅需证明被告实施了禁止行为。
Actus Reus (no MR required for a key element) + No Due Diligence Defence (if offence is absolute) = Strict Liability
犯罪行为（关键要素不要求犯意） + 无尽职抗辩（如属绝对责任罪行） = 严格责任
Courts presume mens rea is required unless the statute clearly excludes it (Sweet v Parsley). Factors pointing to strict liability include: the offence is regulatory, carries a small penalty, concerns public safety, and the wording of the statute omits words like ‘knowingly’. For example, driving without insurance is a strict liability offence. However, some strict liability offences allow a defence of ‘due diligence’ or ‘no fault’, which can be expressed in the formula as a conditional subtraction.
法院推定要求犯意，除非法规明确排除（Sweet v Parsley）。指向严格责任的因素包括：罪行属监管性质、刑罚轻微、涉及公共安全，且法规用语未包含“明知”等词。例如，无保险驾驶即为严格责任罪行。然而，部分严格责任罪行允许“尽职”或“无过错”抗辩，可在等式中表示为条件性减去项。
5. Non-Fatal Offences Quick Formulas | 非致命罪行快速公式
AQA AS Law examines the hierarchy of non-fatal offences against the person under the Offences Against the Person Act 1861 and the common law. Each offence can be reduced to an equation linking actus reus and mens rea.
AQA AS法律考察依据《1861年侵犯人身罪法》及普通法划分的非致命侵害人身罪的层级体系。每个罪行可简化为联系犯罪行为与犯罪意图的方程式。
Assault = Act causing V to apprehend immediate unlawful force + Intention/Recklessness as to that apprehension
袭击 = 引起受害人担心即将遭受非法暴力的行为 + 对此担心持故意或轻率
Battery = Application of unlawful force + Intention/Recklessness as to that application
殴打 = 施加非法暴力 + 对此施加持故意或轻率
s.47 ABH = Assault or Battery + Occasioning Actual Bodily Harm + MR for the initial assault/battery
第47条实际身体伤害 = 袭击或殴打 + 造成实际身体伤害 + 对初始袭击/殴打的犯意
s.20 GBH = Unlawful wounding or inflicting GBH + Intention/Recklessness as to some harm
第20条严重身体伤害 = 非法致伤或造成严重身体伤害 + 对某种伤害持故意或轻率
s.18 GBH with Intent = Unlawful wounding or causing GBH + Specific intent to cause GBH or resist arrest
第18条故意严重身体伤害 = 非法致伤或造成严重身体伤害 + 造成严重身体伤害或拒捕的特定故意
For ABH, ‘actual bodily harm’ includes any hurt or injury calculated to interfere with the health or comfort of the victim (R v Miller), including psychiatric injury. Note that s.20 GBH uses ‘inflict’ which can include indirect harm (R v Martin), while s.18 requires ’cause’ and specific intent. The ladder of seriousness runs assault → battery → s.47 ABH → s.20 GBH → s.18 GBH, each requiring an extra element or a higher mens rea.
就ABH而言，“实际身体伤害”包括任何意图干扰受害人健康或舒适的身体伤害（R v Miller），涵盖精神伤害。注意第20条严重身体伤害使用了“造成（inflict）”，可包含间接伤害（R v Martin）；而第18条要求“引起（cause）”及特定故意。严重程度阶梯为：袭击→殴打→第47条ABH→第20条GBH→第18条GBH，每一级需增补要件或更高犯意。
6. Negligence Liability Framework | 过失侵权责任框架
In tort law, a claim in negligence follows a structured four-step ‘formula’. A claimant must prove each component on the balance of probabilities. If any element fails, the claim fails.
在侵权法中，过失索赔遵循结构化的四步“公式”。原告必须在盖然性衡量上证明每个要件。任一要素不成立，索赔即告失败。
Duty of Care (Caparo) + Breach of Duty (Reasonable Person) + Causation (Factual & Legal) + Remoteness (Foreseeable Kind of Damage) = Negligence Liability
注意义务 (Caparo) + 违反义务 (理性人) + 因果关系 (事实与法律) + 损害遥远性 (可预见种类) = 过失责任
Each stage operates as a filter. Duty of care asks whether the defendant ought to have had the claimant in contemplation. Breach examines whether the defendant fell below the standard of the reasonable person. Causation requires the breach to be both a factual cause and a legal cause of the damage. Remoteness limits liability to damage of a type that was reasonably foreseeable at the time of the breach (The Wagon Mound No 1).
每个阶段如同过滤器。注意义务询问被告是否本应考虑到原告。违反义务审查被告是否低于理性人标准。因果关系要求违反既是损害的事实原因也是法律原因。遥远性将责任限定于违反时所能合理预见的损害类型（The Wagon Mound No 1）。
7. Duty of Care: The Caparo Test | 注意义务：卡帕罗测试
The leading case Caparo Industries v Dickman established a tripartite test for novel duty situations. Where no precedent exists, apply this test to determine whether a duty of care should be imposed.
主导案例 Caparo Industries v Dickman 为新型注意义务情形确立了三重检验法。在尚无先例时，运用此测试决定是否应施加注意义务。
Foreseeability of Harm + Proximity + Fair, Just and Reasonable = Duty of Care
损害可预见性 + 关联性 + 公平、公正且合理 = 注意义务
Foreseeability: would a reasonable person in the defendant’s position have foreseen that the claimant might be injured by their conduct? Proximity: there must be a sufficiently close relationship between the parties, either physical, relational or causal. Fair, just and reasonable: the court considers policy factors, including the floodgates argument and whether imposing a duty would cut across a statutory scheme (Robinson v Chief Constable of West Yorkshire Police). This test must be applied incrementally by analogy with established categories.
可预见性：一个处于被告位置的理性人能否预见到其行为可能伤害原告？关联性：当事人之间必须有足够密切的关系，包括物理、关系或因果上的关联。公平、公正且合理：法院考虑政策因素，包括“诉讼闸门”论点，以及施加义务是否会与法定制度冲突（Robinson v Chief Constable of West Yorkshire Police）。该检验必须通过与现有类别的类比逐步适用。
8. Breach of Duty and the Reasonable Person | 违反义务与理性人
Once a duty is established, the court asks whether the defendant has fallen below the standard of the ordinary reasonable person in the defendant’s circumstances. This is an objective test.
一旦确立注意义务，法院即询问被告是否低于在当时情形下普通理性人的标准。这是一个客观检验。
Standard of Care = Reasonable Person in D’s Position, taking into account: Likelihood of Harm × Potential Severity – Cost of Precautions – Social Utility
注意标准 = 处于被告位置的理性人，考量：损害可能性 × 潜在严重性 – 预防措施成本 – 社会效益
The court weighs the risk factors identified in Bolton v Stone and Paris v Stepney Borough Council: a higher likelihood of injury and greater potential severity demand higher precautions. However, the cost of taking precautions and the social utility of the defendant’s activity may lower the standard (Watt v Hertfordshire County Council). Special standards apply to professionals (Bolam test: a practice accepted as proper by a responsible body of professional opinion) and learners (the standard of the ordinary competent adult; Nettleship v Weston). Children may be judged against the standard of a reasonable child of the same age (Mullin v Richards).
法院权衡 Bolton v Stone 和 Paris v Stepney Borough Council 确定的风险因素：伤害可能性越高、潜在后果越严重，要求的预防措施就越高。但预防措施的成本及被告活动的社会效益可能降低标准（Watt v Hertfordshire County Council）。专业人员适用特殊标准（Bolam检验：被负责任的业内意见体接受的做法）与学习者适用普通合格成人的标准（Nettleship v Weston）。儿童对照同龄理性儿童的标准评判（Mullin v Richards）。
9. Causation and Remoteness in Tort | 侵权中的因果关系与遥远性
After proving breach, the claimant must link the breach to the damage suffered. Tort law uses a similar two-stage causation test as criminal law but applies the balance of probabilities and the concept of remoteness to limit recovery.
证明违反后，原告须将违反与所受损害关联起来。侵权法采用与刑法类似的二阶因果关系检验，但适用盖然性衡量，并以遥远性概念限缩赔偿范围。
‘But For’ Test + Legal Causation (No Novus Actus) + Damage Must Be of a Foreseeable Kind = Actionable Damage
“若非”检验 + 法律因果关系（无新介入行为） + 损害须属可预见种类 = 可诉损害
Factual causation is tested by the ‘but for’ test: but for the defendant’s breach, would the claimant have suffered the loss? For multiple causes, the court may apply the ‘material contribution’ approach where the but-for test is impossible to satisfy (Bonnington Castings v Wardlaw). Legal causation requires no break in the chain; an intervening act must be unforeseeable and independent. Remoteness means the type of damage (not the extent) must have been reasonably foreseeable at the time of the breach (The Wagon Mound No 1). The thin skull rule provides that the defendant must take the victim as found, so unforeseeable extent of injury is recoverable.
事实因果关系通过“若非”检验判定：若非被告的违反，原告是否会遭受损失？存在多个原因时，若无法满足“若非”检验，法院可能采用“实质贡献”路径（Bonnington Castings v Wardlaw）。法律因果关系要求因果关系链未中断；介入行为必须不可预见且独立。遥远性意味着损害的类型（而非程度）须在违反时能被合理预见（The Wagon Mound No 1）。薄头盖骨规则规定，被告须按受害人原状接受，故不可预见的伤害程度仍可获得赔偿。
10. Defences in Criminal and Tort Law | 刑法与侵权法中的辩护理由
Even when all elements of an offence or tort are proven, the defendant may avoid liability by raising a successful defence. This section lists the key defences and their core requirements in equation form.
即便证明罪行或侵权所有要件，被告仍可通过提出有效辩护而免于责任。本节以方程形式列出关键辩护及其核心要求。
Self-Defence (Criminal) = Honest belief in need for force + Reasonable force in the circumstances as D believed them to be
自卫（刑事） = 诚实相信有必要使用武力 + 在被告所认知的情形下使用合理的武力
Consent (Non-Fatal Offences & Tort) = Genuine consent (express or implied) + Capacity to consent + Knowledge of nature and quality of act
同意（非致命罪行与侵权） = 真实同意（明示或默示） + 同意能力 + 了解行为的性质与实质
Voluntary Intoxication = Not a defence to basic intent crimes but may negate specific intent if no prior foresight of consequences (Majewski)
自愿醉态 = 对基本故意罪行不构成辩护，但若事先未预见后果，可否定特定故意（Majewski）
Contributory Negligence (Tort) = Claimant failed to take reasonable care for own safety + Failure contributed to damage → damages reduced by percentage
共同过失（侵权） = 原告未合理注意自身安全 + 该疏忽促成了损害 → 赔偿金按比例扣减
Remember that consent can be used as a defence to assault and battery if the contact is within the bounds of everyday life or a recognised sporting context. In tort, consent (volenti non fit injuria) provides a complete defence if the claimant freely and voluntarily accepted the risk of harm. Intoxication is a complex area: self-induced intoxication is no defence to basic intent crimes such as s.47 ABH or s.20 GBH because getting intoxicated is itself reckless. For specific intent crimes like murder or s.18 GBH, intoxication may prevent the defendant from forming the required intent, leading to a substituted verdict (e.g., manslaughter instead of murder).
注意在接触不超过日常生活界限或经认可的运动情境时，同意可作为袭击与殴打的辩护。在侵权中，同意（volenti non fit injuria）是一完全辩护，但要求原告自由且自愿地接受了伤害风险。醉态是一个复杂领域：自我引起的醉态不能作为基本故意罪行（如第47条ABH、第20条GBH）的辩护，因为醉酒本身即为轻率行为。对于谋杀、第18条GBH等特定
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