IB Command Terms: Precise Definitions and Applications

Mastering the language of assessment is just as critical as mastering subject content. In the International Baccalaureate (IB), every examination question begins with a command term—a specific verb that tells you exactly what examiners expect. Misinterpreting this single word can cost you valuable marks, even if your knowledge is sound. This guide decodes the most common terms, providing precise definitions, structural blueprints, and subject-specific examples to transform how you approach every paper.

Understanding the Command Term Hierarchy

IB command terms are categorized by the depth of thinking they require, moving from foundational recall to sophisticated critical analysis. Recognizing this hierarchy helps you allocate time and mental effort appropriately. Lower-order terms like Outline or Describe typically appear in short-answer questions, while higher-order terms like Evaluate or To what extent form the backbone of essays and extended responses. Your response must match the cognitive demand; a description where an analysis is asked for will immediately cap your score. The command term is your non-negotiable instruction manual for structuring your answer, determining whether you should list, connect, deconstruct, or judge information.

Foundational Command Terms: Demonstrating Knowledge

These terms ask you to present knowledge clearly and concisely, focusing on accurate recall and basic organization.

Outline requires you to give a brief account or summary. You should present the key features or steps in a logical sequence, omitting minor details. For example, in Biology, if asked to outline the process of aerobic respiration, you would list the four main stages (glycolysis, link reaction, Krebs cycle, electron transport chain) with their core inputs and outputs, without detailing every chemical intermediate.

Describe asks for a detailed account. You must characterize the features of a subject, often using sensory or observable qualities. Structure your answer by moving through the subject systematically. In Visual Arts, describing an artwork would involve stating what you see: composition, color palette, visible techniques, and subject matter, without yet interpreting meaning.

Explain means to give a clear reason or mechanism that accounts for something. This term requires you to show the how or why behind a phenomenon, establishing relationships between concepts. Your answer should follow a "because" structure. In Economics, to explain why a demand curve slopes downwards, you would detail the income and substitution effects, linking consumer behavior to the law of demand.

Analytical Command Terms: Breaking Down and Comparing

Here, you must move beyond stating information to interrogating it, identifying components, relationships, and differences.

Analyse is a key term requiring you to break down a concept or data set into its constituent parts, and show how these parts relate to each other and to the whole. This involves unwrapping layers of meaning. In History, to analyse the causes of World War I, you would not just list M.A.N.I.A. (Militarism, Alliances, Nationalism, Imperialism, Assassination) but discuss how these factors interlinked and escalated tension, prioritizing their significance.

Compare and Contrast are often paired. Compare asks you to identify similarities and differences between two or more items, while contrast explicitly asks for differences only. A strong response uses a thematic, integrated structure rather than separate blocks. In Literature, comparing two characters would involve discussing their motivations, traits, and roles under shared thematic headings, noting both parallels and divergences.

Discuss requires a balanced review of a topic, presenting different perspectives, arguments, or implications before reaching a conclusion. It is an open-ended term inviting exploration. In Theory of Knowledge (TOK), to discuss the claim "All knowledge is provisional," you would present compelling evidence from human and natural sciences supporting it, alongside counter-arguments from areas like mathematics, before synthesizing a reasoned judgment.

Evaluative Command Terms: Making Judgments

These are the highest-order terms, demanding critical judgment, substantiated opinions, and nuanced consideration of evidence.

Evaluate asks you to make an appraisal by weighing the strengths and limitations. You must present criteria for judgment and systematically assess the subject against them. The conclusion should be a reasoned judgment of value or worth. In Business Management, to evaluate a marketing strategy, you would assess its effectiveness based on criteria like cost, reach, increased sales, and brand alignment, noting both successes and shortcomings to form a final verdict.

Justify requires you to give valid reasons or evidence to support an answer, conclusion, or decision. It often follows a "state and defend" pattern. You must provide a logical chain of reasoning that convinces the reader. In Mathematics, if asked to justify why a function has no real roots, you would likely calculate the discriminant, show that $b^2-4ac<0$, and explain that this means the graph does not intersect the x-axis.

To what extent is a sophisticated prompt that requires a measured, evidence-based argument about the degree to which a statement or proposition is true. The answer is almost never "completely" or "not at all." You must construct a continuum of truth. A classic structure is: "To a large extent, because of X and Y; however, to a smaller extent, due to Z, thus the statement is mostly true but qualified." In Geography, responding to "To what extent is urban renewal successful?" would involve presenting clear successes (economic uplift) while acknowledging limitations (gentrification, displacement) to arrive at a nuanced, proportional conclusion.

Common Pitfalls

The most frequent mistakes stem from misreading the command term, leading to an answer that is fundamentally misaligned with the question.

Providing Analysis When Only Description is Asked For. Students often believe more writing equals more marks. If a question asks you to describe a graph, stating the trends is sufficient. Launching into a complex analysis of underlying economic causes uses valuable time without earning marks, as it fails to follow the specific command.

Treating "Discuss" or "Evaluate" as "Describe." This is the cardinal sin of IB exams. A discussion that merely lists facts or a one-sided evaluation that only lists advantages will score poorly. These terms explicitly demand multiple viewpoints or a balanced judgment. Failing to present counter-arguments or limitations automatically places your answer in a lower mark band.

Confusing "Outline" with "Explain." An outline is a structured summary; an explain requires causation. For instance, outlining the stages of mitosis involves listing prophase, metaphase, anaphase, telophase. Explaining mitosis involves detailing how spindle fibers separate chromatids. Giving a causal explanation for an "outline" question adds unnecessary detail, while giving a list for an "explain" question misses the core requirement.

Overlooking the Scope of "To What Extent." Many students answer these questions with a binary yes/no argument. The phrase "to what extent" is an invitation to quantify your judgment. A strong answer explicitly uses language of degree ("largely," "partially," "in a limited sense") and balances competing evidence to show proportion, rather than simply arguing for one side.

Summary

• Command terms are explicit instructions: They dictate the depth, structure, and cognitive approach required for your answer. Your first step in any question must be to identify and internalize the command term.
• Match the response to the verb: Foundational terms (Outline, Describe) test knowledge recall and clarity. Analytical terms (Analyse, Compare) require deconstruction and relational thinking. Evaluative terms (Discuss, Evaluate, To what extent) demand critical judgment and balanced argument.
• Structure follows function: The command term implies an essay or paragraph structure. "Compare" suggests an integrated, thematic approach. "Evaluate" requires criteria-based paragraphs. "To what extent" mandates a measured, proportional conclusion.
• Subject context is key: While definitions are consistent, their application varies by discipline. Analyse in History involves weighing historical significance, while in Biology it involves breaking down a process into its component mechanisms.
• Avoid the twin traps of over- and under-answering: Do not provide complex analysis for a descriptive task, and never substitute a simple list for a task requiring explanation or evaluation. Precision in following the command is the hallmark of a high-scoring response.