Subject guide
IB English B Internal Assessment guide
Written and cross-checked by IB Diploma graduates: Alexander (41), Alejandro (40), Martina (40), Victoria (38), Martin (35), Maria (34)
· Checked against official IB guidance · Editorial policy
The IB English B Paper 1 writing task is graded against 3 IB assessment criteria worth 30 marks. This guide explains the mark scheme for each criterion and what the published criteria reward at each score level at Higher Level (HL) and Standard Level (SL).
IB assessment criteria
Each criterion is presented independently using the configured mark-band descriptors for this subject and assessment session.
| Criterion | Name | Marks |
|---|---|---|
| Language | Language | 12 |
| Message | Message | 12 |
| Conceptual Understanding | Conceptual Understanding | 6 |
| Total | 30 | |
Criterion-by-criterion breakdown
Language
Language
What this criterion assesses
Command of written language: vocabulary appropriate to the task and varied (including idiomatic expressions), a variety of basic and more complex grammatical structures used effectively, and accuracy that supports communication.
Mark band descriptors
Criterion A: Language — SL (0–12): - 0: The work does not reach a standard described by the descriptors below. - 1–3: Command of the language is limited. Vocabulary is sometimes appropriate to the task. Basic grammatical structures are used. Language contains errors in basic structures. Errors interfere with communication. - 4–6: Command of the language is partially effective. Vocabulary is appropriate to the task. Some basic grammatical structures are used, with some attempts to use more complex structures. Language is mostly accurate for basic structures, but errors occur in more complex structures. Errors at times interfere with communication. - 7–9: Command of the language is effective and mostly accurate. Vocabulary is appropriate to the task, and varied. A variety of basic and more complex grammatical structures is used. Language is mostly accurate. Occasional errors in basic and in complex grammatical structures do not interfere with communication. - 10–12: Command of the language is mostly accurate and very effective. Vocabulary is appropriate to the task, and varied, including the use of idiomatic expressions. A variety of basic and more complex grammatical structures is used effectively. Language is mostly accurate. Minor errors in more complex grammatical structures do not interfere with communication.
Common mistakes
- Repetitive, basic vocabulary throughout
- Only simple sentence structures attempted
- Errors in basic structures (agreement, tenses) that interfere with communication
- Idioms dropped in unnaturally instead of used purposefully
Message
Message
What this criterion assesses
Fulfilment of the task: ideas relevant to the task, fully developed with details and relevant examples, and presented clearly in a logical, coherent structure that delivers the message.
Mark band descriptors
Criterion B: Message (0–12): - 0: The work does not reach a standard described by the descriptors below. - 1–3: The task is partially fulfilled. Few ideas are relevant to the task. Ideas are stated, but with no development. Ideas are not clearly presented and do not follow a logical structure, making the message difficult to determine. - 4–6: The task is generally fulfilled. Some ideas are relevant to the task. Ideas are outlined, but are not fully developed. Ideas are generally clearly presented and the response is generally structured in a logical manner, leading to a mostly successful delivery of the message. - 7–9: The task is fulfilled. Most ideas are relevant to the task. Ideas are developed well, with some detail and examples. Ideas are clearly presented and the response is structured in a logical manner, supporting the delivery of the message. - 10–12: The task is fulfilled effectively. Ideas are relevant to the task. Ideas are fully developed, providing details and relevant examples. Ideas are clearly presented and the response is structured in a logical and coherent manner that supports the delivery of the message.
Common mistakes
- Ideas listed but never developed with details or examples
- Parts of the task prompt left unaddressed
- No logical paragraph structure, so the message gets lost
- Irrelevant content used to pad out the word count
Conceptual Understanding
Conceptual Understanding
What this criterion assesses
Choice of text type appropriate to the task; register and tone appropriate to the context, purpose and audience; and the conventions of the chosen text type fully incorporated.
Mark band descriptors
Criterion C: Conceptual understanding (0–6): - 0: The work does not reach a standard described by the descriptors below. - 1–2: Conceptual understanding is limited. The choice of text type is generally inappropriate to the context, purpose or audience. The register and tone are inappropriate to the context, purpose and audience of the task. The response incorporates limited recognizable conventions of the chosen text type. - 3–4: Conceptual understanding is mostly demonstrated. The choice of text type is generally appropriate to the context, purpose and audience. The register and tone, while occasionally appropriate to the context, purpose and audience of the task, fluctuate throughout the response. The response incorporates some conventions of the chosen text type. - 5–6: Conceptual understanding is fully demonstrated. The choice of text type is appropriate to the context, purpose and audience. The register and tone are appropriate to the context, purpose and audience of the task. The response fully incorporates the conventions of the chosen text type. Note: A response that ignores context, purpose and audience may receive marks of 0 for criteria B and C, even if the response has received a high mark for criterion A.
Common mistakes
- Wrong text type for the task (e.g. an essay where a letter was required)
- Register or tone mismatched to the audience (too formal or too casual)
- Missing text-type conventions (greeting, sign-off, headline, date…)
- Ignoring the stated context, purpose or audience
Sources & verification
Primary-source references used to verify key assessment facts on this page. Last source check: September 22, 2026.
The exact subject guide for English B is the authority for the task, criteria and limits. Some IB subject guides do not have a stable public URL, so this page names the configured assessment session and links the official IB update hubs instead of fabricating a direct source link.
- IB — Diploma Programme assessment and examsOfficial overview of criterion-related assessment and internal assessment in the Diploma Programme.
- IB — current curriculum updatesOfficial update hub for subject and first-assessment changes. Use it to confirm that your exam session matches the criteria shown here.
Ready to get feedback on your English B Paper 1 writing task?
Upload your draft and get criterion-by-criterion feedback using the configured English B criteria for this assessment session.
Get English B feedback →Stop reading about it
Upload your draft and get criterion-by-criterion feedback in minutes.
