IB World Studies SL Extended Essay Example

The title clearly signals the topic, disciplinary scope, and place of study. This is effective because the reader immediately understands that the essay will evaluate policy effectiveness rather than simply describe plastic pollution.

This research question is clearly phrased and sufficiently specific to sustain an interdisciplinary investigation. The phrasing “to what extent” also opens the door to evaluation rather than a purely descriptive response.

The question is still wider than the evidence later used. It refers to “government policies in the Philippines” in general, but the essay mainly evaluates one local ban and one national EPR policy. Narrowing the policy scope, or specifying which policies are being tested, would make the line of inquiry more fully focused.

The student could strengthen the method by stating clearer selection criteria, such as date range, geography, source type, and relevance to either policy outcomes or species-specific biology. That would make the research process more transparent and easier to evaluate.

This is a useful observation, but the method does not yet explain how the student distinguished “context” sources from evidence that could directly support the final claim. A clearer justification of why each source type was retained or rejected would improve methodological rigor.

The economics framing is appropriate, but the student could define exactly what counts as the “third parties” in this essay before moving into the diagrams. Linking the externality explicitly to coastal ecosystems and seagrass habitat would make the model more tightly aligned to the research question.

The student identifies a relevant biological focus early and connects it to the Philippine context. This helps keep the essay anchored to a specific organism rather than treating marine pollution in general terms.

This conclusion is too definite for the evidence presented here. The student should qualify the claim more carefully and make clear whether the source directly studied Enhalus acoroides or whether it is being used as broader mechanistic support.

This is a strong example of source-based biological explanation because it links a mechanism to a stated ecological effect. The student is beginning to show how evidence can move from plastic debris to plant-level consequences.

The student integrates biology and economics well here by using the ecological damage as evidence of market failure. This is effective interdisciplinary framing because it explains why the policy issue matters economically, not only biologically.

The diagram explanation needs a more careful distinction between market failure and consumer overconsumption. The student should explain the externality in terms of producer and social costs, not simply describe consumers as buying at the “wrong” point.

The explanation is conceptually uneven here. An EPR policy is better described as raising private compliance costs and changing producer behaviour, rather than simply saying that MSC “shifts left.” The student should clarify which curve shifts and why, so the diagram matches the theory more accurately.

The student could strengthen the biology section by briefly previewing how each pathway affects growth differently. A short roadmap would help the reader see how photosynthetic inhibition, toxicity, and root impairment fit together as a coherent causal chain.

This sentence overstates the source evidence and uses imprecise wording. The student should replace informal phrasing with precise biological terminology and ensure the claim is specific to the type of organism and study being cited.

The biological mechanism is well structured, but the wording assumes species-specific evidence that is not fully demonstrated here. The student should show more clearly which parts are direct findings on Enhalus acoroides and which parts are general plant-based mechanisms being transferred to this species.

The inference is plausible, but it is still indirect. The student should be careful not to treat reduced national waste as proof of reduced exposure at seagrass sites without local monitoring data or a clearer leakage pathway.

This is a clear attempt to build a causal chain from policy to environmental outcome to biological impact. The reasoning is stronger because it uses more than one source and does not stay at the level of simple description.

The student uses quantitative evidence to support evaluation, which strengthens the argument substantially. Specific numbers make the policy discussion more convincing than a purely general claim about “success.”

This conclusion is too sweeping. The figure shows business-size distribution, not actual plastic output or compliance behaviour, so the student cannot infer that nearly all firms will produce plastic at the same rate. The claim needs either stronger evidence or a more cautious interpretation.

How directly do the cited studies measure this effect in Enhalus acoroides itself rather than in other plants or organisms? The student would benefit from checking whether the evidence supports transfer of the mechanism, or whether a more qualified statement is needed.

The student moves too quickly from policy change to “direct” biological impact. A stronger evaluation would acknowledge the missing intermediate evidence: changes in leakage, changes in microplastic concentration, and then changes in seagrass condition.

This is one of the strongest analytical moments in the essay because it synthesizes multiple sections into a clear framework. The numbered pathways help the reader see that the argument is not just a list of facts but a structured biological evaluation.

The judgement is reasonable, but the wording needs more explicit comparison criteria. The student should explain whether “more balanced” means better environmental coverage, lower social cost, stronger enforceability, or greater long-term biological benefit.

The essay follows a recognisable academic structure, which helps the reader navigate the investigation. Clear sectional signposting is especially useful in an interdisciplinary essay where biology and economics need to be kept distinct but connected.

The figure is relevant and clearly tied to the discussion. Using a data-based visual at this point helps establish the scale of the problem before the argument moves into policy evaluation.

This visual is relevant, but the explanation should more explicitly connect the chart to the subsequent claim about Enhalus acoroides. At present, the reader is shown the debris composition before the significance for the species is fully unpacked.

The policy sections are sensibly separated, but the structure would be stronger if the evaluation criteria were stated before the policy comparisons begin. That would help the reader understand exactly how effectiveness is being judged.

The conclusion would be even stronger if it briefly restated the comparison criteria used to judge each policy. Repeating the criteria would make the final judgement feel more analytical and less like a summary of earlier sections.