Lecture: What Is Political Science? Subfields, Concepts & Methods
Lecture script · about 15–20 minutes spoken · Week 1
Opening
Think about the last group decision you were stuck with. Maybe a group chat argued for an hour about where to eat and somebody finally booked a table. Maybe your job changed the holiday schedule, or a campus senate added a fee to your bill. Somebody decided, and the decision covered everyone.
That feeling is the doorway into this course. Whether you're a nursing student reading a hospital's new visitor policy, a business major sitting in on a workplace vote about schedules, or a future teacher listening to a school board debate, you keep running into the same question. Is the person talking stating a fact I can check, or a value I have to argue about?
This is the first week of the course, so we start at the foundation. In this lecture I'll show you what makes a decision political, give you two shorthand definitions, the five subfields, a toolkit, and the distinction you'll use every week. Then we'll test the toolkit on a real founding document. Next, in Week 2, we'll ask why anyone obeys a government at all.
1. Politics and political science
Picture a neighborhood association with one small budget for the year. Half the members want streetlights on a dark corner. The other half want a community garden on an empty lot. The money covers one project, not both. And whatever they choose, every household's dues pay for it.
That little fight has three ingredients. There isn't enough to go around, which is scarcity. People want different things, which is disagreement. And the decision binds everyone, including the people who voted the other way. Put those together and you have the thing this course studies.
Politics is collective, binding decision-making wherever scarcity and disagreement meet, whether in a nation, a city, a campus, or a workplace. A parliament counts. So does a workplace deciding who covers the holiday shift.
So what's the science part? Political science is the systematic study of politics, which starts from a question and checks its answers against rules of evidence that anyone can apply. A political scientist looking at the neighborhood fight doesn't start with "the garden people are right." The starting point is a question. Why did the garden win? Then comes the evidence: the vote count, the meeting notes, who showed up, and who stayed home.
Here's the mistake to avoid: thinking political science is having opinions about politics. Two political scientists who disagree about what ought to happen can still agree on what the vote count shows.
Pause and try this. One student decides alone what to eat for lunch. A workplace decides which staff members must work on a holiday. Which one is politics in this course's sense?
Run each one past the three ingredients before you decide.
Here's the answer. The workplace decision is politics, because a group makes a binding choice under scarcity and disagreement, while the lunch choice involves no group at all.
So keep this order in mind: a question first, evidence second, and your verdict last.
2. The shorthand definitions
Two phrases serve as the field's shorthand for politics, and you'll hear both again.
The first comes from Harold Lasswell, in a 1936 book called Politics: Who Gets What, When, How. The title is the definition. Politics is about who gets what, when they get it, and how. On the neighborhood fight, it asks who gets the project, when, and by what kind of vote.
The second comes from David Easton, in a 1953 book called The Political System. Easton described politics as the authoritative allocation of values. The authoritative allocation of values is Easton's shorthand for what a political system does: it makes decisions about who gets what that are accepted as binding on a whole society. The word values here means the things a community prizes and argues over, like money, land, safety, or status.
The idea is old. Aristotle's Politics describes the human being as a political animal. I mention it so you can see how old these questions are.
Here's the trap: chatbots often swap the two and credit "who gets what" to Easton. The fix is to tie each phrase to its year and its title.
Pause and try this. A study guide says, "Easton defined politics as who gets what, when, how." What's wrong with that sentence?
Picture the cover of each book.
Here's the answer. It swaps the thinkers, because "who gets what, when, how" is the title of Lasswell's 1936 book, while Easton's 1953 phrase is the authoritative allocation of values.
Lasswell asks who gets what. Easton says authority allocates it.
3. The five subfields
Here's a short story. A made-up coastal country is deciding whether to sign a treaty with its neighbor that limits fishing in a shared sea. Fishing families worry about their jobs, and scientists worry about the fish. It's one news story. But a political scientist could study it from five directions.
Those directions are the field's subfields. A subfield is one of the five main areas this course uses to divide the discipline, each asking its own kind of question about the same political world.
Political theory and philosophy asks what ought to be. Is it fair to limit fishing families now to protect the fish for families later? Comparative politics compares systems within countries. How does this country's parliament approve a treaty, and how does that compare with the neighbor's process? International relations studies politics between states. Why would two countries with no government above them agree to limit themselves at all? American government studies one case in depth, the United States. How would the same kind of decision move through the institutions of that one well-documented country? And political methodology supplies the tools. How would you measure what the public thinks about the treaty, and how would you know your measure was any good?
One honest note. Five is this course's count. Some departments also list fields like public law or public policy on their own.
The mistake here is treating the subfields as walls, as if a treaty story belongs only to international relations. The same story raises questions for all five. The subfields are lenses, not walls.
Pause and try this. Someone asks, "Should a parliament ever be allowed to bind future generations?" Which subfield owns that question?
Notice the word should.
Here's the answer. It belongs to political theory and philosophy, because it asks what ought to be rather than what is.
One event, five lenses.
4. The toolkit
A carpenter carries a tape measure, a level, a saw, and a square. A political scientist carries four tools, and you'll use all four every week.
Concept application is taking a defined idea, stated precisely, and using it to sort or explain a specific case. Argument analysis is taking an argument apart into its claim, the premises offered for it, and the assumptions it needs, so each piece can be checked on its own. Evidence evaluation is asking what a document, case, or dataset actually shows, what it doesn't show, and whether a pattern in it is a correlation or a cause. And the comparative method is placing a case beside one or more other cases on defined dimensions, so the similarities and differences can narrow down an explanation.
Argument analysis has its own small vocabulary. A claim is a sentence that asserts something can be so or ought to be so. A premise is a claim offered as a reason for accepting another claim. The conclusion is the claim the premises are offered to support. And an unstated premise is an assumption an argument needs in order to work but never says out loud.
Let's run the tools on one speech. A campus senate member says the library should stay open late, because students with day jobs need a quiet place to study at night and the library can't afford the staff. So, the speech concludes, the senate should add a late-night library fee to every student's bill. The conclusion is the fee. The premises are the students' need and the tight budget. And the unstated premise? That every student should share the cost, not only the students who use the late hours. Now compare it with a campus gym that charges only the people who use it. The comparison makes the hidden assumption visible.
A warning. Finding an unstated premise doesn't mean you found a flaw. Every argument rests on assumptions; ask whether this one is reasonable.
Pause and try this. In the library speech, which sentence is the conclusion, and which assumption is never said out loud?
Find the sentence that starts with so.
Here's the answer. The conclusion is that the senate should add the fee to every student's bill, and the unstated premise is that all students, not only the users, should share the cost.
Apply, take apart, test, compare.
5. Empirical versus normative
Now the distinction that runs this whole course. Picture two people at a town meeting talking about a new bike lane. One says, "Since the lane opened, fewer cyclists have been hurt on Main Street." The other says, "The city ought to put cyclists' safety ahead of drivers' convenience." Same bike lane. Different kind of sentence.
You could check the first one against injury reports. The second is about priorities, and no report settles it alone.
An empirical claim is a claim about what is, or why something happens, that can be checked against evidence and can turn out to be false. A normative claim is a claim about what ought to be, such as what is fair or worth doing, that is defended by argument from values and premises and can be argued well or badly.
Two failure modes show up again and again. Smuggling is slipping an ought into a sentence that is presented as a plain statement of fact, like "the data show the city must widen the lane." The word must got smuggled inside the word show. Shrugging is treating a value question as mere opinion, as if reasons made no difference. "Well, that's your opinion" shrugs off an argument instead of answering it.
Here's the trap that catches the most people. They sort a claim by its topic. Take two sentences about the same institution. "The Senate has 100 members." That's empirical, a design fact you can check against Article I, Section 3, which gives two Senators from each State. "The Senate ought to be proportional to population." That's normative, and it has to be argued from values like equal representation. Same topic. Two kinds.
And one more myth: empirical means true and normative means mere opinion. Both halves are wrong. Empirical means checkable, and checkable claims can turn out false. Normative claims are argued well or badly.
Pause and try this. "Most downtown parking spaces sit empty after 8 p.m." Is that empirical or normative?
Ask yourself whether you could go out and count.
Here's the answer. It's empirical, because you could check it by counting empty spaces after 8 p.m., and the count could prove it false.
Is can be checked; ought must be argued.
6. The four moves on a founding text
The Declaration of Independence was adopted in 1776 by the Second Continental Congress, and Thomas Jefferson was its principal drafter. We're going to read its second paragraph as an argument. We want to see how it's built. Every quotation comes from the National Archives transcript.
There are four moves, always in the same order. Define and apply a concept. Find the premises, the conclusion, and the unstated premise. Ask what the evidence shows and doesn't. Compare it to one other case.
Move one. Legitimacy is the widely shared belief that the people in power have a right to be there, and next week builds that idea in full. The paragraph's standard of legitimacy is the consent of the governed. A government's rightful power, on this argument, comes from the people it governs.
Move two. The premises open with "all men are created equal" and with rights that include "Life, Liberty and the pursuit of Happiness." Write that trio down exactly; chatbots love to hand you "life, liberty, and property," which is Locke's trio, not the Declaration's. The conclusion comes next. When a government becomes destructive of those ends, "it is the Right of the People to alter or to abolish it." And the unstated premise? The paragraph never says who judges when a government has become destructive. The argument needs that judge. You won't find one named.
Move three. The transcript shows what the Second Continental Congress adopted in 1776 and how the argument is built. It doesn't show, by itself, whether the premises are true. We're analyzing the argument, not handing down a verdict on it.
Move four. Compare it to an invented campus club whose bylaws let members remove an officer by a majority vote at a called meeting. The club states its judge and its procedure in writing. The Declaration states a right to alter or abolish and names no procedure. Same consent standard, different design.
Then sort the claims; 4 get labelled. "All men are created equal" is normative. "Governments are instituted among Men" is empirical-leaning, a claim about where governments come from. The consent standard is normative. And the right to alter or abolish is the normative conclusion. That's 3 normative and 1 empirical-leaning, which makes 4.
Pause and try this. Of the 4 claims in the sort, which one is the empirical-leaning claim, and why does it get that label?
Think about which sentence describes how things are.
Here's the answer. "Governments are instituted among Men" is the empirical-leaning claim, because it describes where governments come from instead of saying what ought to be.
A quotation without its source is a rumor.
7. Is political science a science?
Political scientists still argue about this question. A chemist can repeat an experiment; a political scientist studying a revolution gets one revolution. So is this field a science at all? I'm going to give you the strongest case on each side, and then the decision is yours.
Proponents argue that political science is a science in the sense that matters. It states claims that can be checked and found false. It follows rules of evidence any careful reader can apply, so two scholars with opposite politics can agree on what a document says or what a vote count shows. And where lab experiments are impossible, it uses comparison to narrow down explanations. On this view, science names a method of checking, not a lab coat.
Critics respond that the label promises more than the field can deliver. People change how they act when they're studied or predicted, and molecules don't. Many political events, like a founding or a war, happen once or a few times, so there are too few cases to test an explanation the way a lab tests a reaction. And the field's normative half, the questions about what ought to be, can't be settled by evidence at all. On this view, calling it a science invites false confidence.
A third position says the field is scientific in its empirical work and philosophical in its normative work. Treat that as one more position to weigh, not as the answer.
The mistake to avoid here is thinking the question has a settled answer you're supposed to memorize. It doesn't. In the discussion, what matters is how fairly you state each side and how well you reason, not which side you pick.
Pause and try this. A classmate says, "Political science can't be a science, because it can't settle whether a law is fair." Which side's argument is that, and which half of the field is the classmate pointing to?
Think about which kind of claim fairness is.
Here's the answer. It's the critics' argument, and it points to the normative half, because a question about whether a law is fair is about what ought to be.
A science in its method, an argument in its values.
Closing
Let me pull it together. Politics is a group's binding decision under scarcity and disagreement, and political science studies it from a question and shared evidence. Lasswell asked who gets what, when, how, and Easton named the authoritative allocation of values. The five subfields are lenses, not walls. The toolkit is concept application, argument analysis, evidence evaluation, and the comparative method. You sort a claim by its kind, not its topic. The Declaration's second paragraph rests on the consent of the governed and never names who judges. And whether the field is a science is yours to weigh.
Next in this module come the slide deck, the Readings and Resources page, the lecture tutorial, the practice set, and the quiz. Then, in Week 2, Power, Authority, Legitimacy & the State, we'll ask why anyone obeys a government at all, and the consent standard comes back as the heart of legitimacy.
Built with The Course Maker · samples.thecoursemaker.com