The three master questions in Topic 1.2 were the discipline's problems. This topic is about its tensions — six arguments that never get settled, not because sociologists are careless, but because both sides of each one are holding on to something true.
You will meet all six for the rest of your life in this subject. Learn to argue every side calmly and you will already be ahead of most people who have read a great deal more than you.
We begin with the deepest of them. Every other tension is, in some way, a version of this one.
The idea, in plain words
Two clarifications that will save you from the most common confusions.
First, structure is not "society over there" and agency is not "the individual". Structures are made of people acting. Agency is exercised by people who are made of their society. The two are not two separate substances in a tug of war; that image is exactly what the best theories try to escape.
Second, structure does not only constrain — it also enables. This is the single most useful thing to understand here, and the standard example is language. The rules of a language are not up to you: you did not invent the grammar, and you cannot simply decide that a word means something else. That is a constraint. But those same rules are the only reason you can say anything at all, including something no human has ever said. Structure is the piano, not the handcuffs. You cannot play any note you like; you can play music that has never existed.
Where the theories stand
Almost every school you will meet in Part 5 can be located by how far it leans.
Leaning towards structure
Émile Durkheim (4.2) insisted that social facts are external to individuals, general across a population, and coercive — they push back when you resist them. He wanted sociology to explain social things by other social things, not by individual psychology. On this view, asking Meera why she chose nursing is almost beside the point; you should be asking why the rate of women entering nursing in that state rose in that decade.
Talcott Parsons (5.1) built an enormous system in which individuals largely occupy roles that the social system needs filled.
Louis Althusser (5.6) went furthest of all. For him individuals are interpellated — hailed, addressed, called into position — by ideology, and what we experience as free choice is the feeling of occupying a slot that was already cut for us. He spoke of history as "a process without a subject." It is the most uncompromising structural position in the discipline, and it is worth understanding precisely because it makes the difficulty vivid.
Leaning towards agency
Max Weber (4.3) demanded verstehen — that we grasp the meaning an actor attaches to their own action. You cannot explain what Meera did without knowing what nursing meant to her.
Symbolic interactionism (5.3) goes further: society is not a thing that acts on people; it is what people are doing when they interpret each other and respond. Herbert Blumer's premise is that people act towards things on the basis of the meanings those things have for them, and that those meanings arise in interaction and get revised in it.
Rational choice and exchange theories (5.5) begin from individuals pursuing goals under constraints, and try to build the big picture upward from there.
The great syntheses
By the 1970s and 80s, most theorists concluded that both extremes were untenable and set out to dissolve the dichotomy. These attempts are among the highest achievements of modern theory, and you will study them properly in 5.10.
Anthony Giddens — structuration. His move is elegant: structure and agency are not two things but two aspects of one process, "the duality of structure." Structure is both the medium and the outcome of action. Language again: you can only speak because English exists; English only continues to exist because people keep speaking it. Every time you use a rule, you reproduce it — and if you use it slightly differently, you have altered it a little. Society is thus continuously being made by the very people it is making.
Pierre Bourdieu — habitus and field. Bourdieu's answer is quieter and, many think, deeper. Recall habitus from 1.1.3: the dispositions you acquired from your position — taste, posture, sense of what is "for people like us." Habitus is structure inside the person. So when Meera "chooses," she is choosing genuinely, with real deliberation, from a menu that her habitus has already pre-sorted into thinkable and unthinkable. Bourdieu's phrase for the result is that people develop "a feel for the game." Nobody forces the outcome; the outcome is nonetheless highly predictable. This is the best available account of why free choices aggregate into rigid patterns.
Margaret Archer — analytical dualism. Archer objected that Giddens fuses structure and agency so tightly that you can no longer study them separately. Her alternative: keep them analytically distinct and track them over time. Structures pre-date the people who confront them; people then reproduce or transform them; the result is the structure the next generation inherits. She calls this the morphogenetic cycle, and it is especially useful for historical work.
Norbert Elias — figurations. Elias disliked the whole vocabulary. He argued we should speak not of "individual and society" but of figurations — shifting webs of interdependent people, like a game in progress. No player controls the game; the game exists only in the playing.
Go deeper
Agency is not equally distributed
Here is the point most introductory treatments miss, and it is essential.
The structure–agency debate is often posed as if it were about human beings in general: are we free? But sociologically, the more revealing question is: who gets how much room to manoeuvre, and why?
A wealthy person facing a bad job market has options: wait, retrain, move, live off savings, use contacts. A poor person facing the same market has almost none of these. A man in many societies can walk home at night making decisions about his route; a woman in the same city is making a different calculation with fewer branches. A citizen can complain to an authority; an undocumented migrant cannot, and both know it.
So agency is itself distributed by structure. Amartya Sen's capability approach (8.8) is essentially an attempt to measure this: not what people are formally permitted to do, but what they are actually able to do. Once you see agency as a resource rather than a universal human attribute, the whole debate becomes sharper and more useful.
The moral stakes are enormous
This is not an abstract quarrel. Where you place the dial has consequences.
Push everything to agency and you get a politics of individual responsibility: the poor chose poorly, the unemployed should try harder, the failing school has bad pupils. Push everything to structure and you get either paternalism (people cannot be trusted to run their own lives) or fatalism (nothing can be done until the whole system changes), and you lose the ability to hold anyone to account for anything.
Marx, of all people, gave the most balanced formulation, and it is worth memorising:
"Men make their own history, but they do not make it as they please; they do not make it under self-selected circumstances, but under circumstances existing already."
Both halves. Always both halves. Part 13 returns to how to hold them together without collapsing into either.
Unintended consequences and the limits of intention
One more reason the dichotomy is too crude: even when people act with full agency and complete knowledge of their own aims, the aggregate result is usually something nobody intended.
Every parent in a city individually decides to coach their child harder to secure an advantage. Because everyone does it, no one gains an advantage, and childhood becomes measurably worse for all of them. Every commuter individually chooses the faster road; the road is now slow. Everyone acted freely; the outcome resembles a structure imposed from above.
Sociologists call this emergence — the appearance, at the collective level, of properties that no individual possesses or chose (see 1.3.2). It is one of the strongest arguments for the reality of structures: they are not mystical, they are what individual actions add up to, and they are nonetheless not reducible to anyone's decision.
Why it matters
This tension is the hinge on which the practical use of sociology turns.
In your own life, it is the difference between two bad stories — "everything is my fault" and "nothing is up to me" — and a third, more accurate one: here is the room I actually have, and here is what would have to change for it to be bigger. That third story is the only one you can act on.
In public argument, almost every dispute about welfare, crime, education, addiction, unemployment and inequality is a structure–agency dispute in disguise. Learning to spot the dial being moved is one of the most transferable skills the discipline offers.
In research, your position on this tension decides your method. If you lean structural you will count things — rates, distributions, flows (7.3, 7.4). If you lean towards agency you will listen to people and watch them closely (7.5). The best work does both, which is exactly why Part 7 refuses to let you specialise too early.