IB coursework is assessed against published requirements, not a general impression of whether it is “good.” These requirements describe the knowledge, thinking, research, communication, and reflection the student must demonstrate. This guide provides IB coursework criteria explained in plain English so parents can understand what marks mean, why polished work can still lose marks, and how to support a student appropriately.
The exact criteria vary by subject, assessment component, level, and syllabus version. A science investigation, History investigation, Mathematics exploration, language oral, Extended Essay, and TOK essay are not judged by the same rubric. The current subject guide and the school’s instructions should therefore remain authoritative.
The basic IB coursework marking system
The Diploma Programme uses both externally and internally assessed work. In many subjects, students complete an Internal Assessment, usually called an IA, which is marked initially by the teacher. The IB then uses moderation to check whether the school has applied the expected global standard.
Other coursework may be externally assessed. The IB overview of Diploma Programme assessment explains that assessment can include investigations, oral work, essays, fieldwork, performances, and other subject-specific tasks.
A typical process looks like this:
- The student completes a specified task.
- The work is judged against separate criteria or strands.
- Each criterion receives a mark or achievement level.
- The criterion marks form a component total.
- The component is weighted within the subject result.
- The final subject result is reported on the 1 to 7 scale.
Weightings vary considerably by course. Parents should not assume that every IA contributes the same percentage or that an IA mark converts directly into a final subject grade.
Assessment objectives, criteria, and grade boundaries
These terms are related, but they do not mean the same thing.
| IB term | Plain-English meaning | Useful question |
|---|---|---|
| Assessment objectives | Broad abilities the course is designed to test | What skills should the student develop? |
| Assessment criteria | Standards used to mark a particular task | What evidence must appear in the work? |
| Markband descriptor | A description of achievement at a particular level | How convincingly is the criterion met? |
| Component weighting | The proportion of the subject result contributed by the task | How much does this component count? |
| Grade boundary | A threshold used when converting combined marks into a grade | What overall mark was needed for a particular grade? |
The IB IA assessment objectives are broad. A humanities course, for example, may expect students to demonstrate knowledge, analyse evidence, evaluate perspectives, and communicate an argument. Coursework criteria translate those abilities into assessable evidence.
A student may understand a topic but lose marks because that understanding is not demonstrated in the required form. Attractive formatting cannot compensate for unsupported conclusions, weak analysis, or missing evaluation.
Common criterion language in plain English
Although rubrics differ, several ideas appear across many subjects.
| Criterion language | What it usually means in practice |
|---|---|
| Focused | Narrow enough to investigate properly within the task limits |
| Relevant | Directly helps answer the research question or prompt |
| Analysis | Explains patterns, relationships, causes, or implications |
| Evaluation | Judges strengths, limitations, reliability, or alternatives |
| Justified | Supported by evidence or logical reasoning |
| Coherent | Logically connected from the question to the conclusion |
| Critical | Tests claims instead of accepting them automatically |
| Reflection | Explains meaningful decisions, changes, and learning |
| Effective communication | Uses clear organization and appropriate terminology, notation, and citations |
Parents sometimes interpret “more detail” as the solution to a low mark. The better question is: Does the added material provide stronger evidence for the criterion? Extra description can consume words without improving analysis.
What criteria look like in different subjects
Criteria cannot be reduced to one universal checklist. The same term can require different evidence depending on the subject.
Science investigations
A science IA may reward suitable investigation design, appropriate data treatment, a conclusion supported by results, and critical evaluation. “Evaluation” does not simply mean stating that human error occurred.
A stronger response identifies a specific limitation, explains how it may have affected the results, and proposes a realistic improvement. For example, uncontrolled temperature fluctuation could be connected to variation in the data, followed by a justified recommendation to use a thermostatically controlled water bath.
Humanities investigations
In History and other research-based subjects, analysis requires more than recounting events or summarizing sources. Students must use evidence to build, test, and refine an argument.
Source evaluation also involves more than declaring that a source is biased. The student should consider how its origin, purpose, context, and content affect its usefulness and limitations for the particular investigation.
Mathematics explorations
Correct calculations matter, but mathematical coursework may also assess communication, interpretation, reflection, and the appropriateness of the mathematics. A sophisticated technique used without understanding may be less convincing than a suitable method that is accurately explained and interpreted.
Reflection can include testing an assumption, comparing approaches, interpreting a result, or explaining why a model does not perfectly match reality.
Essays and oral assessments
For an analytical essay or oral, subject knowledge alone is rarely enough. Students generally need to select relevant evidence, analyse how it supports a claim, and maintain a clear response to the assigned question.
Fluent speech or elegant writing may still underperform if the commentary remains descriptive. The RevisionDojo explanation of IB assessment strands helps distinguish evidence, analysis, evaluation, and communication.
How markbands and best-fit judgments work
Many criteria contain bands with descriptive statements. The marker compares the work with those descriptors and decides which band best represents the demonstrated achievement.
This is usually a best-fit judgment, not a keyword search. Students do not reach the highest band merely by inserting words such as “significant,” “valid,” or “critical.” The reasoning behind those claims must be visible and sustained.
| Level | Plain-English interpretation |
|---|---|
| Low | Limitations or improvements are missing, vague, or generic |
| Middle | Relevant limitations are identified with some explanation or workable improvements |
| High | Important limitations are analysed in relation to results, with specific and justified improvements |
The distinction is not simply length. Higher achievement normally requires more precise reasoning, stronger connections, and better-supported judgment.
Why teacher marks can change after moderation
The word internal does not mean that the mark is controlled entirely by the school. The teacher applies the relevant criteria, and the IB reviews a sample to determine whether the school’s marking aligns with the global standard.
The IB’s assessment guide for students and parents explains that internally assessed work is marked by teachers and moderated by examiners. The school’s IA marks may remain unchanged, rise, or fall after moderation.
Moderation checks the teacher’s application of the marking standard rather than providing a complete re-mark of every submission. An adjustment does not automatically mean that a teacher was careless or that the student’s work somehow became weaker.
Productive questions parents can ask
Parents do not need to become subject examiners. Their most useful role is helping the student translate rubric language into manageable actions.
Useful questions include:
- Do you have the current criteria for your syllabus and examination session?
- Which criterion is strongest, and where is the evidence?
- Which criterion currently needs the most attention?
- Where does the work move from description into analysis?
- Does the conclusion answer the original question directly?
- Which teacher comment should you address first?
- What is the next school deadline?
The RevisionDojo IA guides provide subject-specific explanations, while the complete IA success guide explains the overall process. These resources should supplement, not replace, the teacher’s instructions and current official guide.
What parents should not do
IB coursework must remain the student’s authentic work. The IB’s academic integrity policy supports appropriate help with time management and understanding rules, while prohibiting unauthorized assistance.
Parents may help create a schedule, provide a suitable workspace, listen to the student explain an argument, and encourage questions to the teacher. They should not write paragraphs, perform analysis, select conclusions, substantially edit the student’s language, or commission someone else to improve the submission.
A useful boundary is: support the process, but leave academic decisions and final expression to the student. RevisionDojo’s guide to supporting an IB Internal Assessment gives practical examples of suitable parental help.
How to interpret a disappointing coursework mark
Start with the criterion breakdown rather than the total. A total shows overall performance, while the individual criteria indicate what type of improvement is required.
A student may have strong knowledge but weak analysis, a well-designed investigation but incomplete data treatment, or correct mathematics with limited interpretation. They may also have insightful ideas that are not organized clearly enough to receive credit.
Check the component weighting before drawing conclusions about the final subject result. A disappointing IA mark matters, but examinations and other components also contribute. Teacher estimates, online graders, and provisional marks can guide revision, but they cannot guarantee the moderated mark or final IB grade.
Conclusion
IB coursework criteria describe the evidence a student must demonstrate. Assessment objectives identify broad course skills, criteria translate them into task-specific expectations, and grade boundaries are applied later when subject results are calculated.
Parents can help by asking criterion-based questions, protecting study time, and directing uncertainties to the teacher. Students may also use RevisionDojo’s IB Coursework Grader for provisional rubric-based feedback and Jojo AI to clarify terminology, provided every substantive decision and revision remains their own.
Sources and referenced URLs
- IB Diploma Programme assessment overview
- IB assessment guide for students and parents
- IB academic integrity policy
- RevisionDojo IB assessment strand breakdown
- RevisionDojo IA guides
- RevisionDojo complete IA success guide
- RevisionDojo guide for parents supporting IA work
- RevisionDojo IB Coursework Grader
