How to Write a Top-Scoring IB Biology IA: 8 Essential Tips
Writing a high-scoring IB Biology Internal Assessment (IA) requires careful planning, scientific rigor, and thoughtful reflection. Whether you’re aiming for a 7 or simply want to strengthen your investigation, these tips—based on IB criteria and expert guidance—will help you produce a polished, well-structured IA.
1️⃣ Choose a Clear, Focused Research Question
- Your research question must be specific, manageable, and biologically relevant.
- Define both your independent and dependent variables clearly, with units where appropriate.
- Link the question to real-world context or personal interest to show engagement.
2️⃣ Develop a Strong, Research-Backed Hypothesis
- Formulate a hypothesis based on credible scientific literature.
- Cite at least five reliable sources to provide context and strengthen your rationale.
3️⃣ Design a Detailed, Replicable Methodology
- Include a labeled diagram of your experimental setup.
- List all materials precisely (include quantities and models where relevant).
- Write clear, step-by-step procedures that someone else could follow exactly.
- Identify all variables (independent, dependent, controlled) and address ethical, safety, and environmental considerations.
4️⃣ Collect Sufficient and Accurate Data
- Aim for at least 25 data points (e.g., 5 trials across 5 different values).
- Ensure measurements are precise and recorded systematically.
- Present data in organized tables and well-labeled graphs with units.
5️⃣ Analyze Your Data Thoroughly
- Apply suitable statistical tools (mean, standard deviation, error bars).
- Use graphs and trendlines where appropriate.
- Interpret patterns directly in relation to your hypothesis and research question.
6️⃣ Write a Clear, Evidence-Based Conclusion and Evaluation
- Explicitly state whether your data supports or refutes your hypothesis.
- Critically evaluate your methodology, identifying limitations, uncertainties, and sources of error.
- Suggest realistic improvements or extensions for future research.
7️⃣ Demonstrate Personal Engagement
- Highlight why you chose your topic and how you took initiative in designing and conducting the experiment.
- Reflect on what you learned and how you overcame challenges.
8️⃣ Follow Proper Formatting and Referencing
- Use formal scientific language and avoid casual phrasing.
- Cite all sources consistently in-text and in your bibliography (MLA or another accepted style).
- Ensure neat presentation: 12pt font, clear headings, and consistent formatting.
Summary of Key Tips
- Choose a focused, feasible research question.
- Support your hypothesis with scientific literature.
- Plan a detailed, replicable method.
- Collect sufficient, precise data.
- Analyze thoroughly using appropriate statistics.
- Write a critical, evidence-based conclusion.
- Show personal engagement and reflection.
- Format and reference correctly.
Frequently Asked Questions
How long should my IB Biology IA be?
Your IA should be around 6–12 pages (approximately 2,200 words), including tables, graphs, and diagrams.
How many trials are enough for my Biology IA?
Aim for at least 5 trials per condition with 5 or more values of the independent variable, totaling at least 25 data points.
What statistical tools should I use in my analysis?
Common tools include mean, standard deviation, error bars, and linear regression if appropriate for your data.
Do I need to include ethical considerations?
Yes, even if no ethical issues exist, you should state this clearly in your methodology.
Where can I practice IA writing and get templates?
👉 Check out RevisionDojo for IA writing resources, templates, and high-scoring sample IAs.
