IB DP Subject Mastery: How to Master Command Terms Across All Subjects

IB DP Subject Mastery: How to Master Command Terms Across All Subjects

Command terms are the single clearest signal your examiner gives you about what to write. They’re not a checklist you can ignore — they are the roof, the blueprint and sometimes the scaffolding for every successful IB answer. Master those terms and you move from answering vaguely to answering precisely; you score the marks you deserve.

Across the Diploma Programme, a well-interpreted command term shapes structure, depth and evidence. The same word can feel different in biology, mathematics or history; learning the subtle differences and the practical routines you can rely on under timed conditions is the quickest route to better performance. This guide walks you through why command terms matter, how to approach them in each subject family, a reusable five-step method, exam tactics, focused practice routines and short model answers so you can practise with purpose.

Why command terms matter — and how examiners read them

Command terms translate the examiner’s expectations into instruction. Are you being asked to tell a story, show a mechanism, weigh evidence, or solve an equation? That difference decides how many marks you can realistically capture. A clear example: a question that says “describe” asks for accurate, organised detail; one that says “explain” expects causal links and reasoning. An “evaluate” question requires balanced judgement and criteria, not just a list of facts.

Decode before you write

Every time you see a question, pause for five seconds. Underline the command term and any qualifiers (“with reference to”, “using examples”, “to what extent”, “show that”). Restate the task in your opening sentence: this confirms to the examiner that you understood the instruction and that your entire response will be targeted.

Command terms at a glance

A subject-by-subject playbook

Sciences (Biology, Chemistry, Physics)

In the sciences “explain”, “suggest” and “design” are common. “Explain” expects mechanisms and cause-effect chains: use linking words like “because”, “therefore” and “as a result”. If a question asks you to “suggest” or “propose”, the examiner expects plausible hypotheses or experimental details tied to scientific principles.

• When asked to “explain”: write the conclusion first, then the mechanism, then an example or numerical support if available.
• When asked to “design” or “outline a method”: include variables, controls, sample size, and a brief justification of each choice.
• When asked to “evaluate” a model or method: list strengths, limitations, and suggest improvements or alternative interpretations backed by evidence.

Mathematics

Math command terms require procedural clarity and logical steps. When a paper asks you to “show” or “prove”, examiners expect each inference to be traceable. Short answers without visible steps often lose marks even if the final answer is correct.

• Always label steps and state assumptions (for example, “Let x = …”).
• When a question says “determine” or “find”, present a clean, boxed result after concise working.
• Use diagrams with correct labels where appropriate; an accurate sketch can win method marks.

Humanities (History, Geography, Economics)

Essay-style command terms — “to what extent”, “assess”, “compare” — demand a clear thesis, structured argument and evidence. In history, evidence can be events, sources or historiography. In economics, use models, data and clear assumptions.

• Open with a thesis that answers the question directly; every paragraph should support that thesis.
• Include at least one counterargument or limitation and then weigh it; that is usually where marks for evaluation sit.
• End with a concise judgement that synthesises the evidence.

Languages and Literature

“Analyse” in literature asks you to move from surface features to authorial choices and effects. Close textual evidence, discussion of technique and consideration of context are key.

• Quote accurately and analyse the effect of a word, phrase or structure.
• Connect form and meaning: how does a technique shape interpretation?
• When asked to “compare”, align comparative features directly — theme to theme, device to device.

The Arts and Design

Creative subjects often ask for reflection and justification of choices. “Justify” or “evaluate” here means you must connect your process to outcomes, constraints and intended meanings.

• Use process documentation as evidence: sketches, prototypes, influences, materials.
• When asked to “reflect”, be honest about learning points and how evidence shaped decisions.

TOK, EE and extended writing tasks

Academic questions in TOK and the Extended Essay demand exploration of perspectives, definition of terms and explicit criteria for judgement. Define terms, present knowledge claims and counterclaims, and link to real-life situations or case studies.

A consistent 5-step approach you can use in any subject

Turn any command term into a repeatable routine you rely on under pressure:

• 1. Decode: Underline the command term and qualifiers. Write a one-line restatement of the question.
• 2. Plan (30–60 seconds): Quickly map the structure: number of points, evidence pieces, whether you need a counterargument or a calculation.
• 3. Answer the directive: If the term is “explain”, prioritise causal chains; if it is “evaluate”, set criteria and weigh evidence; for “compare”, arrange points systematically.
• 4. Show evidence and link: Facts without links are weak. Explain why your evidence answers the command term — explicitly link each paragraph to the question.
• 5. Conclude clearly: For judgement questions, end with a succinct verdict using the criteria you established.

Exam-time tactics: turning words into marks

Time pressure is the biggest enemy of good command-term responses. Use these tactics to make every minute count:

• Write the command-term restatement as your first line so the examiner sees alignment instantly.
• Allocate time according to marks. If you have ten minutes for a 10-mark question, plan for 1–2 minutes of planning, 7–8 minutes writing, and a minute to check key links to the command term.
• Use bullet points for short-answer parts when permitted; they can be clearer and quicker than paragraphs.
• Signal evaluation words (“however”, “nevertheless”, “on balance”) when answering “assess” or “evaluate” questions — it helps structure and show weighting.

Practice routines that actually move marks

Deliberate practice beats hours of unfocused revision. Structure practice sessions around command terms, not only topics:

• Daily micro-drills: pick one command term and write a 5–10 sentence focused response to different topics each day.
• Weekly timed practice: do a past-paper question under exam conditions, then annotate where you missed aligning to the command term.
• Peer review: swap answers and check each other specifically for whether the command term was answered, not for general phrasing.
• Keep an error log: note the command terms you consistently misunderstand and prioritise them in revision.

How targeted tutoring and feedback accelerate progress

Targeted, personalised feedback shortens the path from misunderstanding to mastery. A tutor who focuses sessions on command-term interpretation and gives model answers tailored to your weakest terms helps you form reliable habits faster. For students who want one-on-one guidance, Sparkl’s personalized tutoring can provide tailored study plans, expert tutors and AI-driven insights that highlight which command terms you should prioritise to lift your predicted grade.

How to use a tutor productively: bring three timed answers to each session, ask the tutor to identify which marks were lost because the command term was misunderstood, and rehearse the corrected structure aloud. Tutors can simulate examiner feedback and set up progressive challenges that keep practice just beyond comfortable — which is where improvement happens.

Example walkthroughs — short, practical models

Science example: “Explain the effect of enzyme concentration on reaction rate”

Quick structure: 1 sentence claim, 2–3 sentences mechanism, 1 sentence linking to experimental evidence, 1 concluding sentence.

Model skeleton: “Increasing enzyme concentration increases reaction rate up to a point because more active sites are available per unit substrate, which raises collision probability and formation of enzyme-substrate complexes. However, beyond substrate saturation the rate plateaus because substrate becomes limiting; further increases in enzyme concentration produce diminishing returns. Experimental data typically show a hyperbolic curve, indicating a maximum initial rate at high enzyme concentrations. Therefore, enzyme concentration positively affects rate until substrate limitation occurs.”

History example: “To what extent was X a cause of Y?”

Structure: Thesis answering ‘to what extent’, two strong supporting paragraphs with evidence, one paragraph on alternative causes or limitations, concluding judgement weighing evidence.

Model skeleton: “X was a significant cause of Y because… (use two pieces of evidence). Nonetheless, other factors such as A and B also contributed by… Balancing this evidence, X was a primary driver in certain contexts (specify) but not universally; on balance, X accounts for a substantial portion of the outcome, though it must be understood alongside other structural causes.”

Mathematics example: “Show that n(n+1) is even for any integer n”

Structure: State what needs to be shown, present logical steps, final boxed statement.

Model skeleton: “For any integer n, either n is even or n is odd. If n is even, n=2k and n(n+1)=2k(2k+1)=2[k(2k+1)], which is even. If n is odd, n=2k+1 and n+1=2k+2=2(k+1), so n(n+1)=(2k+1)2(k+1)=2[(k+1)(2k+1)], which is even. Therefore n(n+1) is even for any integer n.”

Common traps and how to avoid them

• Confusing “describe” with “explain”: Describe = detail; Explain = causal links. If you see a causal connector in the question, avoid a list-only answer.
• Answering outside the scope: if the question adds “in the context of…”, keep your examples tied to that context.
• Dropping the conclusion: for evaluation questions, failing to make a judgement costs high-value marks.
• Skipping steps in maths/sciences: show at least one intermediate step to gain method marks.

Quick printable checklist for exam day

• Underline command term and qualifiers.
• Restate the task in your first line.
• Plan in 30–60 seconds (structure + evidence).
• Write with signposting language that matches the command term.
• Conclude with an explicit answer or judgement when required.
• Leave time to check links between claims and the command term.

Sample phrases that show you’re answering the command term

• “This suggests that…”
• “A possible explanation is…”
• “On the other hand…”
• “Using X as a criterion, this is…”
• “Therefore, it can be concluded that…”
• “In practical terms, this means…”
• “This is supported by the evidence that…”
• “A limitation of this approach is…”

Final notes: building mastery over months, not minutes

Command-term mastery is an intentional habit you build by practising with purpose. Start small: isolate terms, practise short answers, get targeted feedback and then integrate that practice into timed papers. Over time the mental routine of decoding, planning and explicitly linking evidence becomes automatic, and your answers will reflect clarity and confidence. The mark schemes reward precision — not verbosity — and the habits you form now will pay off across subjects and assessment types.

Conclude: Master command terms and you control the question rather than the question controlling you.