IB Economics SL & HLTopic 5 — Exam Skills and AssessmentAll papersCore skill~8 min read
The Economic Skills Examiners Reward
Every question you will ever meet in IB Economics is testing one of four skills, called assessment objectives. You do not have to memorise them by number. You do have to recognise which one a question is asking for, because writing the wrong kind of answer is how good economists end up with average marks.
📚 What you need to know
There are four assessment objectives: AO1 knowledge, AO2 application and analysis, AO3 synthesis and evaluation, AO4 use of skills.
The command term in a question tells you which one is being asked for.
AO1 to AO3 get progressively more demanding. AO4 is different — it is the technical toolkit, and it runs alongside all of them.
Most questions test more than one objective at once.
Higher objectives sit on top of lower ones: you cannot evaluate well without accurate knowledge underneath.
Knowing the objective tells you how much to write, whether to draw, and whether to judge.
The four skills, in one picture
An evaluation built on a shaky definition falls over. Accuracy first, then application, then judgement.
AO1: knowledge and understanding
This is showing that you know the economics: defining terms precisely, explaining concepts clearly, and using proper terminology instead of everyday language. It is most obvious in short questions, but it quietly sits underneath every long answer too.
A vague definition is not a small problem. If your definition of inflation is “prices going up”, the examiner cannot be sure you understand it, and every later paragraph built on it looks weaker.
AO2: application and analysis
Application means putting the theory into the situation in front of you — the country, the market, the firm, the data. Analysis means showing the links: this causes that, which causes the other. Correct theory that floats free of the context does not score highly, especially in Papers 2 and 3.
AO3: synthesis and evaluation
This is thinking like an economist rather than reciting like a student. You build an argument, look at it from more than one side, and reach a conclusion you can defend. Evaluation is not the same as opinion: it must rest on reasoning, evidence and context.
Evaluation is not a paragraph you bolt on at the end. The strongest answers evaluate as they go — each point is made, then weighed, then linked back to the question.
AO4: the technical skills
AO4 is the practical toolkit: drawing and labelling diagrams accurately, doing calculations correctly, reading numerical and graphical data, and organising an answer so it can be followed. It matters most in Papers 2 and 3, but diagram skill shows up everywhere.
Matching command terms to skills
Objective
Command terms
What your answer must do
AO1
Define, List, State, Describe, Outline
Be precise and short. No development needed.
AO2
Explain, Analyse, Comment on, Distinguish, Apply
Use theory in the given context and show the chain of cause and effect.
AO3
Discuss, Evaluate, Examine, To what extent, Justify, Recommend
Build an argument, weigh both sides, reach a judgement.
AO4
Calculate, Draw, Sketch, Label, Plot, Derive, Determine, Show
Be technically accurate: correct method, units, labels.
If you only remember one thing: define means stop after one sentence, explain means show the mechanism, and evaluate means take a side and say why. Three words, three completely different answers.
Worked examples
WORKED EXAMPLE
Same topic, three command terms, three different answers
The topic is a government subsidy on solar panels. Watch how the answer changes as the command term changes.
“Define the term subsidy.” (AO1)
A payment from the government to producers to lower their costs of production.
“Explain how a subsidy affects the market for solar panels.” (AO2)
Subsidy lowers unit costs → supply shifts right → surplus at the old price → price falls, quantity rises — shown on a labelled diagram.
“Evaluate the use of a subsidy on solar panels.” (AO3)
Same theory, plus: who pays for it, the opportunity cost of the spending, whether demand is responsive enough, and a judgement on when it is worth doing.
One topic, three depthsNotice that the evaluation still contains the explanation. Higher objectives include the lower ones.
WORKED EXAMPLE
Spotting the objective before you write
“Using a diagram, analyse the effect of a tariff on domestic producers in Country Y. [4]”
Step 1: circle the command terms
“Using a diagram” → AO4. “Analyse” → AO2.
Step 2: what is NOT being asked
No “evaluate”, so no judgement paragraph. Writing one wastes minutes.
Step 3: what the answer needs
A labelled tariff diagram, plus a chain: tariff raises the import price → domestic price rises → domestic producers supply more → their revenue rises.
Step 4: keep the focus
On domestic producers only — not consumers, not the government.
Two objectives, four marks, no waffleHalf of exam technique is knowing what to leave out.
💡 Exam tip
Underline the command term first. It decides the shape of the whole answer.
Match your length to the objective. AO1 questions want one or two sentences, not a paragraph.
For AO2, name the context in the first line: the country, the market, the firm, the figure.
For AO3, decide your judgement before you write, then argue towards it honestly, including the other side.
For AO4, slow down. Most lost marks here are labels and units, not understanding.
Learn the command term list the way you learn definitions. It is free marks.
⚠ Common mix-up
Evaluating when only analysis was asked for. It earns nothing and eats your time.
Explaining when only a definition was asked for. Same problem in reverse.
Treating evaluation as opinion. “I think this is bad” is not economics. Reasoning and evidence are.
Correct theory, no context. In Papers 2 and 3 this caps your marks whatever else you do.
Thinking AO4 is only for HL. Diagram accuracy is assessed on every paper.
Assuming a question tests only one objective. A 15-mark question can touch all four.
Up next: Scoring Full Marks on 2-Mark Questions — the smallest questions on the paper, and the ones students most often throw away.
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