science

Three-world model

Three-world model is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Three-world model rather than just read about it. In short: The three-world model is a lens of political analysis describing the world during the Cold War. The model divides the world's nations into three groups: the First, Second, and Third Worlds.

Key takeaways

Three-world model belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Three-world model to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Three-world model from memory before moving on to harder problems.

Reference excerpt

The three-world model is a lens of political analysis describing the world during the Cold War. The model divides the world's nations into three groups: the First, Second, and Third Worlds.

History

Background The terms First World, Second World, and Third World were originally used to divide the world's nations into three categories. The complete overthrow of the pre–World War II status quo left two superpowers (the United States and the Soviet Union) vying for global supremacy during the Cold War. Each power formed their own political blocs, which were the basis of the concepts of the First and Second Worlds. The Third World consisted of countries that were not closely aligned with either bloc.

Cold War Early in the Cold War era, NATO and the Warsaw Pact were created by the United States and the Soviet Union, respectively. They were also referred to as the Western Bloc and the Eastern Bloc. The circumstances of these two blocs were so different that they were essentially two worlds, however, they were not numbered first and second. The onset of the Cold War is marked by Winston Churchill's famous "Iron Curtain" speech. In this speech, Churchill describes the division of the West and East to be so solid that it could be called an iron curtain. In 1952, the French demographer Alfred Sauvy coined the term Third World in reference to the three estates in pre-revolutionary France. The first two estates being the nobility and clergy and everybody else comprising the third estate. He compared the capitalist world (i.e., First World) to the nobility and the communist world (i.e., Second World) to the clergy. The First World countries were characterized by economic prosperity, technological advancement, and political stability, whereas the Second World countries were characterized by state-controlled economies and centralized political structures. Just as the third estate comprised everybody else, Sauvy called the Third World all the countries that were not in this Cold War division, i.e., the unaligned and uninvolved states in the "East–West Conflict." The Third World countries are often described as developing nations with diverse economic, social, and political conditions. With the coining of the term Third World directly, the first two groups came to be known as the "First World" and "Second World," respectively. Here the three-world system emerged.

Post Cold War With the fall of the Soviet Union in 1991, the Eastern Bloc ceased to exist; with it, so did all applicability of the Three-world model.

Illustrations

Worked examples

Example 1 — a first encounter with Three-world model

Start with the simplest possible case. Write down what Three-world model claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Three-world model before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Three-world model ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Three-world model

In research: Three-world model appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Three-world model in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Three-world model is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cold War terminology, Country classifications, Politics by region, so understanding it makes those chapters shorter.
In everyday life: Look for Three-world model outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Three-world model in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Three-world model means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Three-world model out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Three-world model in simple terms?

The three-world model is a lens of political analysis describing the world during the Cold War. The model divides the world's nations into three groups: the First, Second, and Third Worlds.

Why does Three-world model matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Three-world model?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Three-world model.