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Subject guide

IB Environmental Systems and Societies Internal Assessment guide

Written and cross-checked by IB Diploma graduates: Alexander (41), Alejandro (40), Martina (40), Victoria (38), Martin (35), Maria (34)

· Checked against official IB guidance · Editorial policy

The IB Environmental Systems and Societies Individual Investigation (IA) is graded against 6 IB assessment criteria worth 30 marks. This guide explains the mark scheme for each criterion and what the published criteria reward at each score level at Higher Level (HL) and Standard Level (SL).

6 criteria30 marks totalSL & HL available

IB assessment criteria

Each criterion is presented independently using the configured mark-band descriptors for this subject and assessment session.

CriterionNameMarks
Research Question and InquiryResearch Question and Inquiry4
StrategyStrategy4
MethodMethod4
Treatment of DataTreatment of Data6
Analysis and ConclusionAnalysis and Conclusion6
EvaluationEvaluation6
Total30

Criterion-by-criterion breakdown

Research Question and Inquiry

Research Question and Inquiry

0-4

What this criterion assesses

A focused research question addressing a local or global environmental topic or issue, with the topic explained through sufficient background research to support the question.

Mark band descriptors

Criterion A: Research question and inquiry (0–4):
- 0: The student's report does not reach a standard described by any of the descriptors given below.
- 1–2: The report describes a local or global environmental topic or issue but with errors or omissions showing a limited understanding; it states a research question, but there is a lack of focus or it is not linked to the chosen environmental topic or issue.
- 3–4: The report explains a local or global environmental topic or issue with sufficient background research to support the research question; it states a focused research question that addresses the chosen environmental topic or issue.

Common mistakes

  • Research question too broad or not linked to the chosen environmental issue
  • Background research too thin to support the question
  • Environmental context described with errors or omissions
  • No clear link between the issue's significance and the investigation

Strategy

Strategy

0-4

What this criterion assesses

An existing or developing strategy that addresses the environmental issue linked to the research question, with an explanation of a tension between different perspectives (economic, social, cultural, political or environmental) that results from the strategy.

Mark band descriptors

Criterion B: Strategy (0–4):
- 0: The student's report does not reach a standard described by any of the descriptors given below.
- 1–2: The report states an existing or developing strategy that addresses an environmental issue linked to the research question; it describes a tension between different perspectives (economic, social, cultural, political or environmental) that results from the strategy.
- 3–4: The report describes an existing or developing strategy that addresses an environmental issue linked to the research question; it explains a tension between different perspectives (economic, social, cultural, political or environmental) that results from the strategy.

Common mistakes

  • No real-world strategy connected to the research question
  • Strategy named but never described or developed
  • Tension between perspectives stated but not explained
  • Only the environmental perspective considered (no societal counterweight)

Method

Method

0-4

What this criterion assesses

A repeatable method that allows sufficient data to be collected to answer the research question — enough procedural detail that another student could repeat the investigation.

Mark band descriptors

Criterion C: Method (0–4):
- 0: The student's report does not reach a standard described by any of the descriptors given below.
- 1–2: The report describes a method that is not repeatable; the method does not allow for sufficient data to be collected to address the research question.
- 3–4: The report describes a repeatable method; the method allows for the collection of sufficient data to answer the research question.

Common mistakes

  • Method missing the detail needed to repeat it
  • Sample size or sampling strategy too small to answer the question
  • Variables, controls or equipment not specified
  • Data collected that can't actually address the research question

Treatment of Data

Treatment of Data

0-6

What this criterion assesses

Clear and detailed communication of raw and processed data, with processing techniques that lead to findings fully addressing the research question and raw data processed correctly.

Mark band descriptors

Criterion D: Treatment of data (0–6):
- 0: The student's report does not reach a standard described by any of the descriptors given below.
- 1–2: The communication of raw and processed data is not clear; the techniques used to process raw data lead to findings not addressing the research question; the raw data is processed with major errors.
- 3–4: The communication of raw and processed data is clear; the techniques used to process raw data lead to findings not fully addressing the research question; the raw data is processed with some minor errors.
- 5–6: The communication of raw and processed data is clear and detailed; the techniques used to process raw data lead to findings fully addressing the research question; the raw data is processed correctly.

Common mistakes

  • Tables or graphs missing units, labels or clear headings
  • Processing errors that carry into the findings
  • Processed results that don't address the research question
  • Raw data shown but processing steps impossible to follow

Analysis and Conclusion

Analysis and Conclusion

0-6

What this criterion assesses

Analysis that explains the patterns and trends in the data relevant to the research question — including measures of bias, reliability, validity and uncertainty — and a conclusion that addresses the research question and is supported by the analysis presented.

Mark band descriptors

Criterion E: Analysis and conclusion (0–6):
- 0: The student's report does not reach a standard described by any of the descriptors given below.
- 1–2: The analysis identifies patterns or trends within the data that are relevant to the research question; the conclusion either does not address the research question or is not supported by the analysis presented.
- 3–4: The analysis describes patterns or trends within the data that are relevant to the research question, including some measures of bias, reliability, validity and uncertainty; the conclusion addresses the research question and is partially supported by the analysis presented.
- 5–6: The analysis explains the patterns and trends within the data that are relevant to the research question, including measures of bias, reliability, validity and uncertainty; the conclusion addresses the research question and is supported by the analysis presented.

Common mistakes

  • Patterns identified but never explained
  • Bias, reliability, validity and uncertainty ignored in the analysis
  • Conclusion that overreaches what the data supports
  • Conclusion that doesn't answer the stated research question

Evaluation

Evaluation

0-6

What this criterion assesses

An evaluation of specific methodological limitations or weaknesses that impact the conclusion, with evaluated improvements that address them, and unresolved questions arising from the investigation described as they impact the conclusion.

Mark band descriptors

Criterion F: Evaluation (0–6):
- 0: The student's report does not reach a standard described by any of the descriptors given below.
- 1–2: The report states generic methodological limitations or weaknesses that impact the conclusion; states improvements to the method that address the identified limitations or weaknesses; states generic unresolved questions that arise from the investigation.
- 3–4: The report describes methodological limitations or weaknesses that impact the conclusion; describes improvements to the method that address the identified limitations or weaknesses; outlines unresolved questions that arise from the investigation.
- 5–6: The report evaluates specific methodological limitations or weaknesses that impact the conclusion; evaluates improvements to the method that address limitations or weaknesses; describes unresolved questions that arise from the investigation as they impact the conclusion.

Common mistakes

  • Generic weaknesses ("human error") not specific to this method
  • Improvements unrelated to the weaknesses identified
  • Impact of each limitation on the conclusion never assessed
  • No unresolved questions or further-investigation ideas offered

Sources & verification

Primary-source references used to verify key assessment facts on this page. Last source check: September 22, 2026.

The exact subject guide for Environmental Systems & Societies is the authority for the task, criteria and limits. Some IB subject guides do not have a stable public URL, so this page names the configured assessment session and links the official IB update hubs instead of fabricating a direct source link.

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