LAWS50037 · Evidence And Proof
Fact Analysis and Proof
Fact analysis is the half of Evidence and Proof that comes before the law of evidence, and it is what the mid-semester task (30%) marks. It answers two questions about a brief: what must we prove? (the case — a single factual proposition carrying a legal consequence) and how do we prove it? (the proof — the inference chains that link evidence to that proposition). You choose the factual theory that best satisfies the nine Proof [5.70]–[5.170] criteria — comprehensiveness being the heavily-marked one — then build true [6.140] inference chains, distinguishing conjunctive from convergent reasoning. That proof feeds straight into the second skill: the admissibility ladder — relevance (ss 55–56) → exclusionary rule → exception → discretions (ss 135–138) — run item-by-item and purpose-by-purpose, which is the meta-method the 70% exam tests. Master this chapter and the rest of the subject is the same workflow applied to fresh facts.
What this chapter covers
- 01Case vs theory: what must we prove, and the story that makes it true
- 02The nine theory criteria (Proof [5.70]–[5.170]) — comprehensiveness the heavily-marked one
- 03The [6.140] inference relation — reading a connecting line
- 04Conjunctive vs convergent chains ([6.210]–[6.220])
- 05The three-part advice on evidence: theory → proof → impact of the law
- 06The admissibility ladder: relevance → rule → exception → discretions
- 07Item-by-item, purpose-by-purpose analysis
Worked example: building a one-rung inference chain
- +1(a) Fix the rung. The evidence rationally supports the intermediate proposition ‘a car resembling the accused’s was at the warehouse around 11pm’, which makes the case proposition (‘the accused was there’) more probable. State the rung as a [6.140] relation, not a bare fact.
- +1(a) Read the connecting line. A line means: if the proposition at the bottom is true, it makes the proposition at the top more probable. Phrase the evidence as ‘[Witness] will say in court that …’ feeding that specific rung.
- +1(b) Classify the combination. The car evidence and the CCTV are convergent: two independent items each pointing at the same conclusion (presence at 11pm), so together they raise the probability more than either alone. They would be conjunctive only if the conclusion required both to be true as separate necessary links.
- +1(b) Say why it matters. Convergent chains are robust — knocking out one item leaves the other standing; conjunctive chains are only as strong as their weakest necessary link.
- +1(c) Name the weakness. The most-tested gap is the unstated assumption: ‘a car like the accused’s’ is not ‘the accused’s car’, and presence of the car is not presence of the accused. A comprehensive theory must take a position on that ambiguity, not leave ‘no conclusion’.
Key terms
- Case (the proposition to prove)
- A single factual proposition to the effect that an event with legal consequences has occurred — the destination of the proof. You advise on the set case exactly as instructed; mislabelling it (adding ‘intentionally’ or ‘murdered’ when the set case is narrower) creates needless work and loses marks.
- Theory (the factual narrative)
- The story that explains all the evidence and makes the case proposition true — the route. You pick the theory that best satisfies the nine Proof [5.70]–[5.170] criteria. It states the how and why, not a bare chronology of events.
- Comprehensiveness
- The heavily-marked theory criterion: take a clear position on all the evidence, especially the ambiguous or complicating facts. Reaching ‘no conclusion’ on a contested event is the cardinal error of the fact-analysis task.
- Conjunctive vs convergent chains
- Two ways inference items combine ([6.210]–[6.220]). Conjunctive: separate necessary links that must all hold — only as strong as the weakest. Convergent: independent items each pointing at the same conclusion — together stronger than either alone, and robust to losing one.
- The admissibility ladder
- The meta-method the 70% exam tests, run per item and per purpose: relevance (ss 55–56) → an exclusionary rule (hearsay s 59, opinion s 76, tendency s 97 …) → an exception → the discretions (ss 135–138, s 137 mandatory in crime). Master the ladder and the open-book exam becomes navigation.
Fact Analysis and Proof FAQ
What is the difference between the case and the theory?
The case is what you must prove — a single legally-significant proposition (e.g. ‘the accused stabbed V’). The theory is the narrative that explains the evidence and makes that proposition true. The case is the destination; the theory is the route. The two most common errors are mislabelling the case (proving more than the set case requires) and writing a bare chronology instead of a theory that gives the how and why.
How do markers decide which theory is best?
Against the nine Proof [5.70]–[5.170] criteria: consistency with instructions, minimalism, simplicity, legal significance, internal consistency, plausibility, clarity, comprehensiveness and flexibility. Comprehensiveness carries the most weight — you must take a position on every piece of evidence, especially the ambiguous facts. Arguing the opposite of the set case, or reaching ‘no conclusion’ on a contested event, is fatal.
What is the difference between a conjunctive and a convergent inference chain?
A conjunctive chain links propositions that must all be true for the conclusion to follow — it is only as strong as its weakest necessary link. A convergent chain has independent items each separately supporting the same conclusion — together they raise the probability more than either alone, and the chain survives losing one. Naming which you have, and why, is exactly what the proof part of the task rewards.
How does fact analysis connect to the law-of-evidence exam?
They are one workflow. Fact analysis builds the proof — the inference chains and the precise rational use of each item. The law-of-evidence half then runs each significant chain through the admissibility ladder: is the item relevant, does an exclusionary rule bite, is there an exception, do the discretions exclude it? Because hearsay attaches to the rung (the use), pinning down the use in the proof is what makes the admissibility analysis clean.
Exam move
Practise the two skills as one artefact — an advice on evidence with three parts: state the theory, build the proof, evaluate the impact of the law. For the theory, write the set case in one line exactly as instructed, then test your narrative against the nine criteria, spending most effort on comprehensiveness (a position on every ambiguous fact). For the proof, draw real [6.140] chains and label each combination conjunctive or convergent; phrase every evidence node as ‘[Witness] will say in court that …’ feeding one specific rung, because that phrasing is what later fixes the hearsay use. Then drill the admissibility ladder on past briefs until relevance → rule → exception → discretions is automatic. Always state the rational use of an item before testing any rule.
