Four contested ideas — and the framework they share with AP Comparative Government.
Everything we study this year hangs from four concepts: power, sovereignty, legitimacy, and interdependence. The IB treats them as a conceptual thread woven through every unit — present even when a topic does not name them. They are also what the philosopher W. B. Gallie called essentially contested concepts: ideas whose meaning is itself part of the political argument. To ask “is this regime legitimate?” is not to look up a fact but to take a position.
The same four ideas are the spine of the AP Comparative Government course you may sit alongside this one — but AP arranges them differently, into five “Big Ideas” tested across six countries. Learning to translate between the two vocabularies is its own skill. Each concept below carries an AP Bridge that does exactly that.
When the IB asks about “power” and the AP asks about “power and authority,” are they asking the same question — and what does each framework let us see that the other hides?
The IB names four key concepts and treats them as lenses. The work is to interpret — to show how a concept is understood, prioritized, and disputed by different stakeholders in a given context.
4 key concepts · interpretation-first · assessed through inquiry & the Engagement Activity
AP names five Big Ideas that recur across five units and six required countries. The work is to apply and compare — to deploy concepts in authentic contexts and argue from evidence.
5 Big Ideas · 5 units · 6 countries · 5 disciplinary practices
The architectures rhyme more than they differ: the AP framework even uses the IB's own words, calling its Big Ideas “themes that become threads that run throughout the course.” The diagram below maps each IB concept onto the AP Big Idea(s) it carries — and marks the two places the frameworks do not line up cleanly, which are the most instructive of all.
Reading the map: a concept can split (sovereignty feeds two Big Ideas), pair tightly (legitimacy → LEG), or find no home (the AP idea of democratization has no standalone IB concept). Those mismatches are where the two frameworks teach different habits of mind.
Power can be seen as the ability to effect change. Rather than a unitary or independent force, it is better understood as an aspect of relations among people functioning within a social organization. Contested relationships between people and groups dominate politics — never more so than in an era of globalization.
Anchors: Lasswell's shorthand — politics as “who gets what, when, how” — and Steven Lukes's three faces of power (decision-making, agenda-setting, and shaping what people want in the first place). For power exercised between states, Keohane & Nye on power within interdependence.
AP framing: “Political systems and regimes govern societies and determine who has power and authority. They shape the level of legitimacy and produce different policy outcomes.”
The IB asks what power is (relational, contested). AP asks who holds it and through which institutions, and pairs power with authority — power accepted as rightful. Note the move: AP's coupling already folds the IB concept of legitimacy into power. You will test this not by definition but by comparing the six countries (China, Iran, Mexico, Nigeria, Russia, UK).
Sovereignty characterizes a state's independence, its control over territory, and its ability to govern itself. Some theorists argue this power is being eroded by aspects of globalization — borderless communication and trade that states cannot fully control; others argue sovereign states still wield enormous power in their national interest, and that this is unlikely to change.
Anchor: Stephen Krasner's four-part typology — domestic, interdependence, international-legal, and Westphalian sovereignty. The vocabulary lets you say precisely which sovereignty a case puts under pressure, rather than arguing past one another about whether “sovereignty” is in decline.
AP has no standalone Big Idea for sovereignty, so it splits. A state's capacity to govern itself sits inside PAU; the globalization-erosion question sits inside IEF, where AP defines external forces as “the increasing worldwide flow of goods, investments, ideas, and people… largely unconstrained by national borders.”
Keep this in mind: because AP never isolates the word, Krasner's typology is the tool that keeps your sovereignty argument from sliding between the two Big Ideas unnoticed.
Legitimacy refers to an actor or action commonly considered acceptable to a population. It is the fundamental rationale for all forms of governance. Its most accepted contemporary form is some version of democracy or constitutionalism — periodic, defined chances to choose who governs — but where that is not the norm, other sources emerge: hereditary or traditional leadership recognized by a people as their own.
Anchor: Max Weber's three pure types of legitimate authority — traditional (it has always been so), charismatic (the gift of the leader), and rational-legal (rules and offices, not persons). Real regimes blend all three.
AP framing: “Political legitimacy is the degree to which a government's right to rule is accepted by the citizenry. Governments that maintain high levels of legitimacy tend to be more stable…”
This is the tightest match of the four, and the sources are the same Weberian ones. AP's addition is the payoff: it ties legitimacy to stability and governability — a legitimate state finds it easier to enact and enforce policy. Same concept, with a consequence attached.
Interdependence is the mutual reliance among groups, organizations, geographic areas, and/or states for access to resources that sustain living arrangements. Most often economic (trade), it also has a security dimension (defense arrangements) and, increasingly, a sustainability dimension (environmental treaties). Globalization has deepened it — and in doing so, reshaped power relationships among actors.
Anchor: Keohane & Nye's complex interdependence — multiple channels connect societies, issues lack a fixed hierarchy, and military force loses its primacy. Interdependence is rarely symmetrical: the less dependent party in a relationship holds the power.
AP framing: external forces, “especially globalization,” as the worldwide flow of goods, investments, ideas, and people across porous borders.
Same phenomenon, different vantage point. The IB stands between the actors and describes a relationship (mutual reliance). AP stands inside the state looking out and describes a force pressing on the regime. When you write for AP, frame globalization as something that acts on a country; when you write for IB, frame it as a tie between countries.
AP's third Big Idea, DEM, treats democratization as “a process that involves the adoption of free and fair elections, the extension of civil liberties, and the establishment of the rule of law… a long-term and often uneven process.” The IB has no standalone concept for it.
Instead it lives distributed across the IB map: partly inside legitimacy (democratic versus traditional sources of the right to rule) and partly inside the IB's wider key concepts of human rights and development. The thing to hold onto: democratization is a process concept, not a static one. It asks not “is this state legitimate?” but “which way, and how fast, is it moving?”
AP's fifth Big Idea, MPA · Methods of Political Analysis, is not a content concept at all — it is the discipline's toolkit: collecting data, describing patterns, and borrowing from economics, sociology, history, and geography. In the IB it has no concept-label, because the same habits live in our inquiry-first approach and, above all, in the Engagement Activity. The five AP disciplinary practices are simply that toolkit made examinable:
Benson S. Hawk, JD
Humanities Department · Newark Academy
IB Global Politics · 2026–2027