How IB marking works

The IB uses criterion-based assessment. Marks are awarded according to published criteria and grade descriptors, not by comparing students to each other.

The 1–7 scale

Each subject is graded 1 (lowest) to 7 (highest). Grade descriptors describe the quality of work at each level:

Grade	Descriptor	Typical characteristics
7	Excellent	Sophisticated understanding, independent analysis, precise expression
6	Very good	Strong understanding, convincing analysis, clear structure
5	Good	Solid understanding, valid analysis, adequate expression
4	Adequate	Satisfactory knowledge, generally valid, basic structure
3	Satisfactory	Some understanding, sometimes valid, limited development
2	Poor	Limited understanding, weak development
1	Very poor	Minimal evidence of understanding

Assessment criteria (rubrics)

Each subject has assessment criteria (rubrics) that define what is required for each mark band. For example:

• Criterion A: Knowledge and understanding
• Criterion B: Application and analysis
• Criterion C: Evaluation and synthesis
• Criterion D: Use of language / presentation

Criteria vary by subject. Marks are given per criterion, then combined.

Levels of response

For extended questions, levels of response descriptors are used. Examiners match the answer to a level (e.g. Level 1–3 or 1–5) and award marks accordingly. Higher levels require more depth, evaluation and structure.

Moderation

Internal assessments are marked by teachers and moderated by the IB. A sample of work is reviewed; if marking is off, all students in that subject/class may have marks adjusted.

Grade boundaries

Final grade boundaries are set each session using global candidate performance. They are not fixed in advance.

Tips for students

• Know the criteria—past papers and subject guides show what is rewarded
• Match the level—extended questions need developed, evaluative answers
• Address all parts—multi-part questions need all sections covered

How Tutopiya helps

Tutopiya tutors use IB criteria and rubrics to guide students. Explore IB resources or book a free trial.

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Source: IB Assessment