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IA Playbook

Biology IA Criteria Guide

Design a focused investigation, control variables cleanly, and evaluate with biological precision.

This guide keeps the Biology IA anchored to a clear research question, reliable data collection, uncertainty-aware processing, and a conclusion that is honestly supported by the evidence.

Criteria Breakdown

Did You Know? The easiest score jumps usually come from explicitly naming what the criterion rewards and supporting it with direct evidence.

Criterion A: Personal Engagement (2 marks)

Examiner Focus

Assesses the extent to which the student engages with the exploration and makes it their own.

Top-Band Move

The evidence of personal engagement with the exploration is clear with significant independent thinking, initiative or creativity. The justification given for choosing the research question and/or the topic under investigation demonstrates personal significance, interest or curiosity. There is evidence of personal input and initiative in the designing, implementation or presentation of the investigation.

Common Penalty

The evidence of personal engagement with the exploration is limited with little independent thinking, initiative or creativity. The justification given for choosing the research question and/or the topic under investigation does not demonstrate personal significance, interest or curiosity. There is little evidence of personal input and initiative in the designing, implementation or presentation of the investigation.

Criterion B: Exploration (6 marks)

Examiner Focus

Assesses the extent to which the student establishes the scientific context, states a clear research question, and uses appropriate concepts and techniques.

Top-Band Move

The topic is identified and a relevant, fully focused research question is clearly described. Background information is entirely appropriate. Methodology is highly appropriate. Full awareness of safety, ethical or environmental issues.

Common Penalty

The topic is identified and a research question of some relevance is stated but not focused. Background information is superficial. Methodology is only appropriate to a very limited extent. Limited awareness of safety, ethical or environmental issues.

Criterion C: Analysis (6 marks)

Examiner Focus

Assesses the selection, recording, processing and interpretation of data relevant to the research question.

Top-Band Move

Sufficient relevant raw data. Appropriate and accurate data processing. Full consideration of measurement uncertainty. Correct and detailed interpretation.

Common Penalty

Insufficient relevant raw data. Basic data processing is too inaccurate or insufficient. Little consideration of measurement uncertainty. Incorrect or insufficient interpretation.

Criterion D: Evaluation (6 marks)

Examiner Focus

Assesses the evaluation of the investigation and results with regard to the research question and scientific context.

Top-Band Move

Detailed, justified conclusion fully supported by data. Correct comparison to scientific context. Discusses methodological weaknesses. Discusses realistic improvements.

Common Penalty

Conclusion is not relevant or not supported by data. Superficial comparison to scientific context. Outlines practical/procedural weaknesses. Outlines few realistic improvements.

Criterion E: Communication (4 marks)

Examiner Focus

Assesses whether the investigation is presented and reported clearly to support effective communication.

Top-Band Move

Presentation is clear. Report is well structured and coherent. Relevant and concise. Appropriate terminology with minor errors.

Common Penalty

Presentation is unclear. Report is not well structured. Understanding is obscured by irrelevant information. Many errors in terminology.

Markbands

Criteria point markbands to benchmark where your current draft sits and what a stronger band demands.

Criterion A: Personal Engagement (2 marks)

Points 0

The student's report does not reach a standard described by the descriptors below.

Points 1

The evidence of personal engagement with the exploration is limited with little independent thinking, initiative or creativity. The justification given for choosing the research question and/or the topic under investigation does not demonstrate personal significance, interest or curiosity. There is little evidence of personal input and initiative in the designing, implementation or presentation of the investigation.

Points 2

The evidence of personal engagement with the exploration is clear with significant independent thinking, initiative or creativity. The justification given for choosing the research question and/or the topic under investigation demonstrates personal significance, interest or curiosity. There is evidence of personal input and initiative in the designing, implementation or presentation of the investigation.

Criterion B: Exploration (6 marks)

Points 0

The student's report does not reach a standard described by the descriptors below.

Points 1-2

The topic is identified and a research question of some relevance is stated but not focused. Background information is superficial. Methodology is only appropriate to a very limited extent. Limited awareness of safety, ethical or environmental issues.

Points 3-4

The topic is identified and a relevant but not fully focused research question is described. Background information is mainly appropriate. Methodology is mainly appropriate but has limitations. Some awareness of safety, ethical or environmental issues.

Points 5-6

The topic is identified and a relevant, fully focused research question is clearly described. Background information is entirely appropriate. Methodology is highly appropriate. Full awareness of safety, ethical or environmental issues.

Criterion C: Analysis (6 marks)

Points 0

The student's report does not reach a standard described by the descriptors below.

Points 1-2

Insufficient relevant raw data. Basic data processing is too inaccurate or insufficient. Little consideration of measurement uncertainty. Incorrect or insufficient interpretation.

Points 3-4

Relevant but incomplete raw data. Appropriate but limited data processing. Some consideration of measurement uncertainty. Broadly valid but incomplete interpretation.

Points 5-6

Sufficient relevant raw data. Appropriate and accurate data processing. Full consideration of measurement uncertainty. Correct and detailed interpretation.

Criterion D: Evaluation (6 marks)

Points 0

The student's report does not reach a standard described by the descriptors below.

Points 1-2

Conclusion is not relevant or not supported by data. Superficial comparison to scientific context. Outlines practical/procedural weaknesses. Outlines few realistic improvements.

Points 3-4

Conclusion is relevant and supported by data. Some relevant comparison to scientific context. Describes methodological weaknesses. Describes some realistic improvements.

Points 5-6

Detailed, justified conclusion fully supported by data. Correct comparison to scientific context. Discusses methodological weaknesses. Discusses realistic improvements.

Criterion E: Communication (4 marks)

Points 0

The student's report does not reach a standard described by the descriptors below.

Points 1-2

Presentation is unclear. Report is not well structured. Understanding is obscured by irrelevant information. Many errors in terminology.

Points 3-4

Presentation is clear. Report is well structured and coherent. Relevant and concise. Appropriate terminology with minor errors.

Build Sequence

Did You Know? Most weak drafts fail from sequence chaos, not lack of ideas.

Step 1

Shape one focused question

Pick a biological relationship that can be measured clearly and kept narrow enough to investigate well.

Step 2

Design for control

Define variables, controls, and repeats so the method is reproducible and the data is worth trusting.

Step 3

Process data with care

Show calculations, graphs, and uncertainty handling clearly so the analysis reads as scientific rather than descriptive.

Step 4

Evaluate against the evidence

Link your conclusion to the data, compare it to biological context, and suggest improvements that directly address weaknesses.

Submission Checklist

  • Research question is specific and testable.
  • Methodology is detailed enough to replicate.
  • Raw and processed data are presented with units and uncertainty where relevant.
  • Conclusion and evaluation are grounded in the evidence, not guesswork.

Quick Wins

  • State the independent, dependent, and controlled variables in one clean planning table.
  • Add uncertainty notes to the data table before writing the analysis.
  • Use one sentence at the end of each paragraph to tie back to the research question.

Did You Know?

Turn Biology Data Into A Higher Band Draft

Marksy grades your Biology IA against IB criteria, highlights gaps in analysis and evaluation, and shows exactly what to improve before submission. Marksy is built to grade faster with criterion-level precision, so you can improve before final submission.

1. Upload your IA draft PDF to Marksy.
2. Get criterion-by-criterion feedback fast.
3. Revise and resubmit with focused improvements.
Marksy grading results view

Instant Grading Results

See where your score is now, not just where it could be.

Marksy criteria-wise feedback highlights

Criterion-Level Feedback

Marksy explains feedback by rubric criterion, so revision is targeted.

Marksy actionable todo feedback list

Action List To Improve

Get concrete next edits instead of vague "improve analysis" advice.

Marksy AI detection and highlight review

Confidence And Integrity Signals

Review flagged sections and strengthen authenticity before submission.

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