LAWS90295 Chap.2 Sources of International Law
Sources of International Law
Treaty sets the chapter's scale
Sources of International Law begins with Topic 2 organises treaties, custom, general principles and subsidiary means around the traditional sources framework. The chapter is not a list of labels: it asks the reader to use Treaty, Customary International Law and Subsidiary Means for different parts of a legal-analysis argument.
Treaty fixes the object of analysis.
An international agreement governed by international law that binds its parties according to its terms. In the Treaty analysis, this definition determines which evidence belongs in the answer and which attractive detail should be left outside the claim.
Customary International Law carries the central connection. General practice accepted as law, commonly analysed through practice and opinio juris.
A strong explanation names the change, relationship or interpretive move rather than placing Customary International Law beside the evidence and expecting the reader to infer the link.
Subsidiary Means supplies a consequential test. Judicial decisions and teachings used to help determine rules rather than create a universal hierarchy of precedent.
The test matters only when it can narrow, redirect or overturn the initial reading built from Treaty and Customary International Law.
Customary International Law links evidence to the claim
The practical difficulty is citing a court or scholar can be mistaken for identifying the underlying source of the asserted rule.
To control that difficulty, annotate every piece of evidence with one role: establish Treaty, support the move through Customary International Law, or challenge the conclusion through Subsidiary Means.
A useful paragraph built around Treaty therefore contains a bounded claim, specific evidence, the inferential bridge supplied by Customary International Law, and a qualification tied to The weight of material depends on context; source categories do not create a single mechanical ranking for every issue.
Work the changed case before memorising a conclusion: Replace a widely ratified treaty rule with a claim against a non-party and reconsider the source route.
In this Customary International Law transfer, the changed fact reveals whether the original result followed from the evidence or merely from a familiar phrase.
Subsidiary Means changes the conclusion
When two interpretations remain possible, compare their treatment of Treaty.
The better account should explain more of the observed material through Customary International Law while taking the limitation attached to Subsidiary Means seriously.
Retrieval practice for Subsidiary Means should reproduce the three concept definitions, one evidence route and one counter-case from memory.
Reopening the source for Subsidiary Means is then used to correct the first missing link, not to reward fluent but unsupported recall.
For assessment transfer from Treaty, change the medium, actor or factual setting while preserving the chapter question.
If the same chain from Treaty through Customary International Law to Subsidiary Means still works, explain why; if it fails, identify the exact premise that no longer holds.
What this chapter covers
- 01
Treaty
- 02
Customary International Law
- 03
Subsidiary Means
- 04
Evidence route for Customary International Law
- 05
Boundary test through Subsidiary Means
Resolve a changed Treaty case
- 3State the case-specific meaning of Treaty and exclude one irrelevant detail.
- 3Trace the evidential or operational move carried by Customary International Law.
- 2Use Subsidiary Means to compare the preferred account with a plausible alternative.
- 2Report a conclusion limited by The weight of material depends on context; source categories do not create a single mechanical ranking for every issue.
Key terms
- Treaty
- An international agreement governed by international law that binds its parties according to its terms.
- Customary International Law
- General practice accepted as law, commonly analysed through practice and opinio juris.
- Subsidiary Means
- Judicial decisions and teachings used to help determine rules rather than create a universal hierarchy of precedent.
Sources of International Law FAQ
Under the applicable legal analysis, when do Treaty and Customary International Law support different answers?
They diverge when the case fits the category named by Treaty but the relationship proposed through Customary International Law lacks evidence or faces a stronger alternative. Replace a widely ratified treaty rule with a claim against a non-party and reconsider the source route. Resolve the tension with Subsidiary Means, not with assertion.
Under the applicable legal analysis, when should Subsidiary Means revise an initial reading?
Use Subsidiary Means after the first account has been made explicit, not as a decorative final term. Replace a widely ratified treaty rule with a claim against a non-party and reconsider the source route. Revision is warranted when the comparison changes the object, mechanism or evidential reach identified by Treaty.
Assessment move
Retrieve Treaty, Customary International Law and Subsidiary Means without notes, then reconstruct the evidence route described in Topic 2 organises treaties, custom, general principles and subsidiary means around the traditional sources framework. Apply that route to this changed task: Replace a widely ratified treaty rule with a claim against a non-party and reconsider the source route.
Finish by stating how The weight of material depends on context; source categories do not create a single mechanical ranking for every issue. limits the answer. Check the live The University of Melbourne assessment instructions before using any operational requirement for LAWS90295.
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