Complete Guide to IB Internal Assessment (IA) with Examples

Complete Guide to IB Internal Assessment (IA) with Examples

The IB Internal Assessment, commonly called the IA, is an important part of the International Baccalaureate Diploma Programme. Unlike final examinations, the IA gives students an opportunity to explore a subject through an individual investigation, analysis, experiment, or project.

A strong IA is not simply about choosing an interesting topic. Students need to develop a focused research question, use appropriate methods, analyse evidence carefully, and communicate their findings clearly.

This guide explains the main stages of creating an IB IA and provides examples of possible approaches across different subjects.

What Is an IB Internal Assessment?

An Internal Assessment is coursework completed by an IB student as part of the assessment requirements for a particular subject.

The exact IA format, weighting, criteria, and requirements depend on the subject and the applicable IB syllabus.

Depending on the subject, an IA may involve:

An investigation Experimental research Mathematical exploration Data analysis Literary analysis Economic investigation Historical investigation Scientific research Language or cultural analysis

Students should always check the current subject-specific IB requirements before starting their IA.

Why Is the IA Important?

The IA allows students to demonstrate skills that may not be fully measured through a traditional examination.

These can include:

Independent thinking Research skills Analysis Critical thinking Application of subject knowledge Evaluation Communication Academic organisation

Because the IA contributes to the overall subject assessment, students should treat it as an important academic component rather than a final-minute assignment.

Step 1: Choose the Right IA Topic

Topic selection is one of the most important early decisions.

A good topic should be:

Relevant to the subject Focused enough to investigate Suitable for the available time Supported by reliable evidence or data Interesting to the student Appropriate for the assessment criteria

Avoid topics that are too broad.

For example:

Too broad: "The impact of social media on teenagers."

More focused: "To what extent does daily social media usage correlate with sleep duration among students aged 16–18?"

The second topic provides a clearer direction for research and analysis.

Step 2: Develop a Focused Research Question

The research question should define exactly what the investigation is trying to discover.

A strong research question is specific rather than descriptive.

Example: Biology

Weak: "How does temperature affect plants?"

Better: "How does temperature affect the rate of seed germination in mung beans over seven days?"

Example: Chemistry

Weak: "Acids and reaction rates."

Better: "How does hydrochloric acid concentration affect the reaction rate with magnesium under controlled conditions?"

Example: Mathematics

Weak: "Mathematics in sports."

Better: "How accurately can projectile motion be modelled to estimate the trajectory of a basketball shot?"

The exact requirements for research questions vary by subject, so students should make sure their question fits the current subject guidance.

Step 3: Plan Your Investigation

Once the research question is established, decide how you will investigate it.

Consider:

What data or evidence is required? What variables need to be controlled? What sources will be used? What mathematical or statistical methods are appropriate? What equipment or software is needed? How will reliability be evaluated? What limitations might affect the results?

A detailed plan can prevent unnecessary changes later.

Step 4: Collect Reliable Evidence or Data

The quality of your evidence directly affects the strength of your analysis.

Depending on the subject, this may involve:

Primary experimental data Surveys Interviews Published datasets Academic sources Historical documents Financial data Literary texts Scientific measurements

Students should keep clear records of where information comes from and how data was collected.

Avoid relying heavily on unsupported websites or sources that do not provide evidence for their claims.

Step 5: Analyse the Data

Analysis is often where an IA moves from basic description to meaningful academic investigation.

Do not simply present tables or graphs. Explain what the results show.

For quantitative data, analysis may include:

Averages Percentages Rates Graphs Correlations Statistical tests Mathematical models

For qualitative subjects, analysis may involve:

Comparing evidence Identifying patterns Examining themes Evaluating arguments Interpreting language Connecting evidence to the research question

The analysis should always connect back to the investigation.

Step 6: Explain Your Results

After analysing the evidence, explain what the findings mean.

Ask:

What pattern can be observed? Does the evidence support the research question? Were the results expected? Were there unusual results? What factors may explain the outcome? How reliable is the evidence?

Avoid simply writing:

"The graph shows that the value increased."

Instead, explain why the increase matters and how it relates to the research question.

Step 7: Include Evaluation

Evaluation demonstrates critical thinking.

A strong evaluation should identify both strengths and limitations of the investigation.

For example:

Strength: The experiment used multiple trials, reducing the influence of random variation.

Limitation: The temperature was monitored manually, which may have introduced measurement inconsistencies.

Then explain how the limitation could be improved.

Do not simply create a list of weaknesses. Explain how each limitation affects the results.

Step 8: Write a Clear Conclusion

The conclusion should directly answer the research question.

It should be based on the evidence presented in the investigation.

A useful conclusion structure is:

Answer → Evidence → Explanation → Qualification

For example:

"The results indicate that increasing temperature increased the rate of germination within the tested range. The highest average germination rate occurred at 25°C, although the limited number of temperature conditions means that the result should not be generalised beyond the tested range."

This is stronger than simply stating the final result.

Step 9: Use Sources and Referencing Correctly

Academic sources should be cited consistently.

Depending on the subject and school requirements, students may use a recognised referencing system such as APA or MLA.

Keep track of sources from the beginning rather than trying to reconstruct them at the end.

Your references may include:

Books Academic papers Government publications Reliable databases Reputable organisations Primary documents

Make sure every source actually supports the information for which it is being cited.

IA Examples by Subject IB Biology IA Example

Research question: "How does light intensity affect the rate of photosynthesis in an aquatic plant?"

The student could measure oxygen production at different light intensities while controlling variables such as temperature, plant size, and carbon dioxide availability.

The analysis could include averages, graphs, uncertainty, and evaluation of experimental limitations.

IB Chemistry IA Example

Research question: "How does the concentration of hydrochloric acid affect the reaction rate with magnesium?"

The investigation could measure the volume of hydrogen produced over time at different acid concentrations.

The student would analyse reaction rates, compare results, discuss uncertainties, and evaluate experimental controls.

IB Physics IA Example

Research question: "How does the angle of projection affect the horizontal range of a projectile?"

The student could collect experimental measurements and compare them with a mathematical model.

The analysis could examine relationships between launch angle and range while discussing experimental uncertainty.

IB Maths IA Example

Research question: "How effectively can a mathematical model predict the trajectory of a basketball shot?"

The student could use functions, coordinates, regression, or calculus-based methods to model the trajectory.

The exploration should demonstrate mathematical reasoning rather than simply describing a real-world situation.

IB Economics IA Example

A student could investigate a specific economic issue using a relevant real-world article and apply appropriate economic concepts.

For example:

Research focus: "The impact of a change in indirect taxation on consumer demand for a specific product."

The analysis could apply concepts such as demand, elasticity, government intervention, and market outcomes.

Common IA Mistakes to Avoid Choosing a Topic That Is Too Broad

A broad topic can make it difficult to conduct meaningful analysis within the required word limit.

Describing Instead of Analysing

Simply explaining what happened is not enough. Students should interpret evidence and connect it to the research question.

Using Too Many Sources

More sources do not automatically mean better research. Focus on relevant and reliable evidence.

Ignoring Limitations

Every investigation has limitations. Recognising and evaluating them demonstrates stronger critical thinking.

Leaving the IA Until the Last Minute

An IA requires planning, research, analysis, drafting, feedback, and revision. Starting early gives students enough time to improve their work.

Using AI or Other Tools Inappropriately

Students should follow their school's and the IB's academic integrity requirements. AI tools should not replace the student's own thinking or be used to produce assessed work in ways that violate IB rules.

How to Make an IA Stronger

A strong IA usually has a clear connection between every section.

The basic flow should be:

Research Question → Method → Evidence/Data → Analysis → Evaluation → Conclusion

If a section does not contribute to answering the research question, consider whether it is necessary.

Students should also review their draft against the relevant subject-specific assessment criteria before submission.

Final IA Checklist

Before submitting, check:

Is the research question focused? Does the investigation directly address the question? Are sources reliable and properly referenced? Is the data clearly presented? Is the analysis more than simple description? Are limitations explained? Does the conclusion answer the research question? Is the work clearly organised? Have citations and references been checked? Does the final submission follow the current IB subject requirements? Final Thoughts

A strong IB Internal Assessment is built through a clear research question, thoughtful investigation, reliable evidence, meaningful analysis, and honest evaluation.

The goal should not be to make the IA unnecessarily complicated. A focused investigation with strong reasoning is often more effective than a very broad project containing large amounts of information.

Start early, follow the subject-specific requirements, keep accurate records, and use feedback to improve the final submission. Most importantly, make sure the work reflects your own thinking and follows IB academic integrity expectations.