How to Choose the Right IB IA Topic: Ideas, Examples & Research Question Tips
Choosing an IB Internal Assessment topic can feel overwhelming. Many students know they need a strong IA, but they are unsure where to begin, how specific the topic should be, and whether their idea is actually workable.
The truth is, a good IA topic is not just about being “interesting.” It needs to be focused, practical, measurable, and suitable for meaningful analysis. Whether you are working on an IB Chemistry IA, Physics IA, Biology IA or Maths IA, the topic you choose can shape the entire quality of your work.
In this guide, we’ll help you understand how to choose the right IB IA topic, how to turn it into a solid research question, and what mistakes to avoid.
Here are the most important things every IB student should keep in mind while choosing an IA topic:
What Makes a Good IB IA Topic?
A strong IB IA topic should balance interest, feasibility, and depth. It should allow you to investigate a clear question and show genuine understanding of the subject.
Specific & Focused
Your topic should not be too broad. A narrow topic usually leads to better analysis.
Researchable
You should be able to gather data, conduct investigation, or work with relevant material.
Subject Relevant
Your IA topic must clearly connect to the concepts and expectations of your IB subject.
Measurable
Especially in science, your investigation should involve variables and clear outcomes.
Practical
You should have access to the tools, materials, time, and data needed to complete it.
Interesting to You
Choose a topic you genuinely care about—you’ll spend a lot of time working on it.
7 Questions to Ask Before Choosing Your IA Topic
If you are unsure whether an idea is worth pursuing, ask yourself these questions first:
1. Am I genuinely interested in this topic?
If the topic does not interest you, the research and writing process can become much harder.
2. Can I turn this into a clear research question?
A good IA topic should naturally lead to a focused and answerable question.
3. Can I measure or analyse something clearly?
Your topic should allow meaningful observation, data collection, or analytical discussion.
4. Do I have access to equipment or data?
A brilliant idea may fail if it is not practical in your school or home setting.
5. Is the scope manageable?
A topic that is too wide can lead to weak analysis and unclear conclusions.
6. Is there enough depth?
Choose something that allows you to explain concepts, interpret findings, and reflect properly.
7. Does it align with IB expectations?
Always make sure your topic supports the criteria and goals of your subject-specific IA.
Bonus: Have I discussed it with my teacher?
Early feedback can save time and help you refine your topic before you go too far.
How to Turn an IA Topic into a Research Question
Many students start with a broad idea and struggle to narrow it down. That is completely normal. The goal is to move from a general area of interest to a question that is precise and investigable.
Example:
- Broad topic: Caffeine
- Better direction: Effect of caffeine concentration on a measurable outcome
- Research question: How does caffeine concentration affect the heart rate of Daphnia magna under controlled conditions?
A good research question usually identifies:
- The independent variable
- The dependent variable
- The context or conditions
IB IA Topic Ideas by Subject
You do not need a huge list of 100 ideas. You just need the right type of idea—one that is workable and relevant.
IB Chemistry IA
- Effect of temperature on the rate of a reaction
- How concentration affects reaction rate
- Comparing vitamin C content in fruit juices
- Investigating acidity in household substances
IB Physics IA
- How angle affects projectile range
- Factors affecting pendulum motion
- Investigating resistance in a wire
- Relationship between light intensity and distance
IB Biology IA
- Effect of pH on enzyme activity
- Impact of light intensity on photosynthesis
- How temperature affects seed germination
- Microbial growth under different conditions
IB Maths IA
- Modelling population growth
- Optimisation in packaging design
- Statistics in sports performance
- Exploring patterns through calculus or probability
Common Mistakes Students Make While Choosing an IA Topic
Choosing a topic that is too broad
Broad topics often lead to shallow investigation and unclear conclusions.
Trying to be overly original
You do not need a never-before-seen topic. You need one that you can execute well.
Ignoring practical limitations
If you do not have the tools, time or data, the investigation may become difficult to complete.
Choosing something with no measurable variables
This is especially risky for science IAs, where measurement and analysis matter a lot.
Copying topics directly from the internet
Use published ideas for inspiration, not as something to copy blindly.
Skipping teacher feedback
A quick discussion with your teacher can help you avoid major problems later.
The best IA topic is not the most complicated one — it is the one that is focused, feasible, and allows strong analysis.
Frequently Asked Questions
How do I choose an IB IA topic?
Start with a subject area you enjoy, then narrow it down into a specific, practical and researchable question.
Does my IA topic have to be unique?
No. It does not have to be completely unique. What matters more is how well you frame, investigate and analyse it.
What makes a good IA research question?
A good research question is clear, focused, manageable and suitable for investigation or analysis within the IA format.
Can I change my IA topic later?
In many cases, yes—but it is best to refine it early, after discussing it with your teacher, to avoid losing time.