Describe (low mark tariff)
Give the key features. No explanation needed, no judgement. Factual recall, organised.
Aim for one developed point per mark
No 'because' needed — just accurate detail
Cambridge O Level 2147
🏛️ O Level History Reference Sheet 2026
Source evaluation and essay frameworks for Cambridge O Level History (2147) — structured questions, source-based papers and the command words that decide your mark.
Source Evaluation Essay Structure Command Words Paper 1 & 2
Our reference sheets are free to download — save this one as PDF for offline revision.
Aligned with the latest 2026 syllabus and board specifications. This sheet is prepared to match your exam board’s official specifications for the 2026 exam series.
O Level History — Technique Beats Knowledge
Most students who lose marks in Cambridge O Level History (2147) know the content. What they lose marks on is answering the wrong question, explaining without judging, or describing a source instead of evaluating it. This reference sheet gives you the frameworks that convert what you already know into marks.
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Source evaluation frameworks (NOP, provenance, purpose)
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Structured essay templates by mark allocation
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Command word guide — what each verb demands
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How to write a judgement that earns top-band marks
Command Words — What Each One Demands
The command word sets the ceiling on your mark. Describing when asked to explain caps you in the lowest band.
Explain why / Explain how
Give reasons and develop them. Each reason must be supported with specific factual detail and linked explicitly to the outcome.
The word 'because' should appear in every paragraph. If it doesn't, you're describing.
Point → specific evidence → explicit link to the question
Two or three well-developed reasons beat five listed ones
How far / To what extent / Do you agree
This demands a two-sided answer AND a judgement. One-sided answers are capped mid-band however good they are.
A conclusion that restates both sides without deciding is not a judgement.
Arguments supporting the statement
Arguments against the statement
A judgement that explains WHICH side is stronger and WHY
Why was … important / significant
Consequences, not just events. Significance means impact on people, policy or later events.
Short-term consequences
Long-term consequences
Who was affected, and how seriously
Source Evaluation — The NOP Framework
Never describe a source. Every source question is about reliability, purpose or usefulness.
N — Nature
What type of source is it? A private diary, a public speech, a cartoon, a government memo, a photograph? Each type has built-in tendencies.
Private source → less need to persuade → often franker
Public speech → audience to win → expect selection and spin
Cartoon → deliberately exaggerated → tells you opinion, not fact
O — Origin
Who produced it, when, and where? Position and timing shape what someone could know and would say.
Was the author present? Could they actually know this?
Written at the time, or years later from memory?
Whose side were they on?
P — Purpose
Why was it produced? This is the highest-scoring strand and the one most students skip.
Purpose beats origin. 'Written by a German general' is weak; 'written to shift blame away from himself' is strong.
To inform, to persuade, to justify, to warn, to record, to sell?
Who was the intended audience?
What did the author want that audience to do or think?
Cross-Referencing Sources
When asked whether sources agree, compare the claim, not the tone.
Both sources agree that… as shown by '…' and '…'
They differ on… because Source A was produced to… while Source B…
Explain the disagreement using provenance, not just 'they are different'
'How useful is this source?'
Useful and reliable are not the same. A biased source is highly useful as evidence of attitudes.
Never dismiss a source as 'biased so not useful'. That phrase costs marks.
Useful FOR WHAT — always name the enquiry
What it tells us directly (content)
What it tells us indirectly (the fact that someone said this, to this audience)
Its limits — what it leaves out, and why
Essay Structure by Mark Allocation
Match your length and shape to the marks on offer. Over-writing a 4-mark question loses you time you need later.
4-mark describe question
No introduction. Four distinct, accurate points
One sentence each is enough
Roughly 5 minutes
6-mark explain question
No introduction needed
Two or three developed reasons
Each: assertion → specific detail → link
Roughly 8–10 minutes
10-mark 'how far' question
Write the judgement even if you're running out of time. A missing judgement is the single most expensive omission on the paper.
One-line introduction stating your line of argument
2 paragraphs supporting
2 paragraphs challenging
A judgement paragraph that weighs them and decides
Roughly 18–20 minutes
Writing a Judgement That Scores
The judgement is where top-band marks live. These are the moves.
Weigh, don't summarise
The most significant factor was… because, unlike the others, it…
While … contributed, it was only decisive once …
Overall the evidence supports … to a limited extent, because …
Use a criterion
Say what you're measuring by — scale, duration, number of people affected, whether the outcome would have happened anyway.
Judged by long-term impact, …
In terms of the number of people affected, …
Without …, the outcome would still have …, so …
Avoid these endings
'In conclusion, there were many factors.' 'Both sides have good points.' 'It depends on your point of view.' All three score zero for judgement.
Commit to an answer. Examiners reward a defended position, not neutrality.
Causation, Consequence and Change
The three conceptual spines of almost every History question.
Types of Cause
Long-term cause — conditions building over years
Short-term cause — immediate triggers
Trigger / spark — the final event
Necessary vs sufficient — would it have happened without this?
Linking Causes
Top answers show how causes interact rather than listing them separately.
This mattered only because … had already …
These two reinforced each other: …
Without the underlying …, the trigger would have had no effect
Measuring Change
What changed, and what stayed the same (continuity)
Pace — gradual or sudden?
Extent — complete, partial, superficial?
For whom — change is rarely uniform across a population
How to Use This Reference Sheet
Boost your Cambridge exam confidence with these proven study strategies from our tutoring experts.
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Underline the command word before you write
Two seconds, and it prevents the single commonest error on the paper — describing when the question says explain, or explaining when it says 'how far'.
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Purpose is the highest-value source skill
Most students reach origin and stop. Asking 'why was this produced, and for whom?' is what separates mid-band from top-band source answers.
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Always write the judgement
On 'how far' questions, a balanced answer with no judgement is capped. Even one decisive sentence rescues several marks.
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Learn dates in clusters, not lists
Group events into three or four phases per topic. You need chronology to argue about causation, but you don't need every date — you need the sequence.
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Never say 'biased, so unreliable'
Bias is a reason a source is useful evidence of attitudes. Explain what the bias reveals instead of dismissing the source.
Reference Sheet FAQ
Quick answers about this free PDF and how to use it for exam revision and active recall.
Is the Cambridge O Level History Reference Sheet 2026 free to download as a PDF?
Yes. This Tutopiya formula sheet is free to use and you can download it as a PDF from this page for offline revision. There is no payment or account required for the PDF download.
What History topics and equations does this formula sheet cover?
This page groups key History formulas in one place for revision. Exam technique guide for Cambridge O Level History (2147). Source evaluation frameworks, structured essay templates, command word guide and mark allocations for Papers 1 and 2. Always cross-check with your official syllabus and past papers for your exam session.
Can I use this instead of the official exam formula booklet in the exam?
No. In the exam you must follow only what your exam board allows in the hall—usually the official formula booklet or data sheet where provided. This page is a revision and teaching aid, not a replacement for board-issued materials.
Who is this formula sheet for (Secondary)?
It is written for students preparing for assessments at Secondary in History, including classroom revision, homework support, and independent study. Teachers and tutors can also share it as a quick reference.
How should I revise with this formula sheet?
Work through past paper questions, quote the correct formula before substituting values, and check units and notation every time. Pair this sheet with timed practice and mark schemes so you see how examiners expect working to be set out.
Where can I get more help with History revision?
Explore Tutopiya’s study tools, past paper finder, and revision checklists linked from our tools hub, or book a trial lesson with a subject specialist for personalised support alongside this formula reference.
Need Help with O Level History?
Work on source evaluation and essay judgement with a specialist History tutor, using past papers from your own syllabus options.
Next step
Knowing the reference sheet isn't the same as knowing how to answer
Most marks are lost to technique, not content — describing when the question says explain, missing the mark scheme trigger, or misreading the command word. The Exam Technique Cheat Sheet breaks down what each command word demands and what examiners actually reward, question type by question type.
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This reference sheet covers exam technique for Cambridge O Level History (2147). The frameworks are content-independent and apply to whichever syllabus options your centre teaches.
Paper structure, option choices and mark allocations are set by the syllabus for your session. Always check the current Cambridge 2147 syllabus before relying on a mark tariff.