ESS IA format and structure

02 Dec ESS IA format and structure

Reviewed 4 October 2026 · Current ESS SL and HL course, first assessment 2026.

Your ESS IA format and structure should make the investigation easy to follow and provide evidence for the current criteria. The outline below is a practical organisation suggestion for SL and HL, not a compulsory template or a guarantee of marks.

ESS IA format and structure: current requirements

The current individual report has a maximum of 3,000 words and is assessed out of 30 marks. It contributes 25% at SL and 20% at HL. Check the official IB ESS guide with your teacher and use our current IA criteria guide for the six criteria and their marks.

Use headings that suit your investigation. A field comparison, survey or secondary-data analysis will not necessarily use the same method language as a controlled experiment. Presentation choices such as centring every table cell do not replace evidence for the assessment criteria.

A practical outline for your report

1. Environmental issue and research question

Explain the environmental issue, give relevant context and state a focused research question. Show how the question connects to the issue. Define the quantities, comparison, location or period needed to understand the investigation, including units where appropriate.

Keep background information relevant and cite sources. A long general introduction or an account of personal interest does not substitute for explaining the issue and question. For an observational study, avoid wording that assumes a causal relationship before you have evidence.

2. Strategy and perspectives

Describe an existing or developing strategy addressing an issue central to the investigation. Explain a tension between perspectives and how it affects environmental or societal outcomes. Research the actual context and support the perspectives with evidence.

This addresses criterion B, Strategy. It is not simply a final sentence proposing a solution, and it is distinct from evaluating weaknesses in your investigation. The official IB course update explains the revised emphasis.

3. Method

Describe a method another person could follow. Explain relevant sampling or data-selection decisions, how measurements or responses are obtained and how the procedure answers the question. Include equipment, units, conditions and safety or ethical considerations where relevant.

For a secondary-data investigation, identify the original source, selection rules, coverage and data limitations. For a survey, explain the population, sampling, wording and coding. There is no universal sample size or statistical test that guarantees marks.

4. Data treatment

Present relevant raw and processed data clearly. Label tables and graphs, give units and explain processing sufficiently for the reader to understand and check it. Choose calculations that help answer the question.

For example, if you compare group means, explain the calculation and consider variation and the sampling design. Do not add standard deviation, a significance test or error propagation solely because it appears sophisticated. The tool must suit the data and question.

5. Analysis and conclusion

Interpret relevant patterns and connect them to the research question. Discuss evidence, variation and uncertainty where relevant. State a conclusion supported by your analysis and environmental context.

A correlation alone does not establish causation. Distinguish what the investigation shows from what remains uncertain and avoid extending a conclusion beyond the sample, place or period studied.

6. Evaluation

Discuss specific weaknesses and limitations, explain how they affect the findings and propose realistic improvements. Identify unresolved questions. “Use more samples” is more useful when you explain what uncertainty it would address and whether it is feasible.

Keep methodological evaluation distinct from the discussion of a strategy and perspectives. Each serves a different purpose in the current criteria.

Sources and supporting material

Cite information, datasets and ideas accurately. Follow your teacher’s guidance on the IB word-count conventions and submission requirements. Do not hide essential analysis in an appendix or treat a title page or contents page as a separate assessment criterion.

Check your ESS IA format and structure before submission

1. Can the reader understand the issue and research question?
2. Is the strategy and tension between perspectives explained?
3. Could another person follow the method or data-selection procedure?
4. Do the processing and graphs help answer the question?
5. Does the conclusion stay within the evidence?
6. Are limitations and improvements specific?
7. Are sources clear and the report within the applicable word limit?

This checklist supports planning; it does not replace the official descriptors or your teacher’s guidance. Your investigation, analysis and writing must remain your own.

Get help organising your ESS IA

Bring your question, method notes or a draft outline to Marija Maletz. Individual ESS IA guidance can help you identify missing evidence, understand the criteria and plan your next step without replacing your own decisions or writing.

If you are earlier in the process, read how to choose an IA topic or our survey and secondary-data planning guide.

Need help applying this to your ESS work?

Explore online IB ESS tutoring for SL and HL with Marija Maletz or request a free 20-minute trial. Bring your level, the question or topic you find difficult, and your availability.