How to Write the Introduction of an Expository Essay

The introduction is the first impression the reader has of your essay, and it plays a critical role in setting the tone and direction for the entire piece. In a dissertation-style or expository essay, your introduction should clearly introduce the topic, provide necessary background information, and present your thesis statement. In this article, we will guide you through the steps to craft a compelling introduction that will engage your reader and set up a strong foundation for the rest of your essay.

1. Start with a Hook

The hook is the very first part of your introduction, and its purpose is to grab the reader’s attention. A good hook makes the reader want to keep reading and sets the stage for the rest of the essay.

Use a Thought-Provoking Question

Starting with a question can engage your reader’s curiosity and encourage them to think about the topic. For example, if your essay is about climate change, you could start with a question like, “How much longer can we ignore the warning signs of climate change before it’s too late?”

Present an Interesting Fact or Statistic

Presenting an interesting or surprising fact or statistic is another effective way to catch the reader’s attention. For example, “Every year, over 8 million tons of plastic enter the world’s oceans, causing irreparable damage to marine life.”

Use a Relevant Quote

A relevant and thought-provoking quote can provide a solid start to your essay. Choose a quote that directly relates to the topic and adds depth to your argument. For example, “As environmentalist David Attenborough said, ‘The future of all life on Earth depends on the survival of the natural world.’”

Tell a Short Anecdote or Story

Sometimes, a short and relevant anecdote or story can captivate your reader’s attention. If you’re writing about the effects of pollution, you might begin with a brief story of a specific event, like the mass extinction of a species due to habitat loss.

2. Provide Background Information

After the hook, you should provide some context and background information to help your reader understand the issue you’ll be addressing. This information should be brief but informative enough to frame the argument you’re going to make in your essay.

Define Key Terms or Concepts

If your topic involves complex terms or concepts, define them briefly to ensure that the reader understands the subject. For example, if writing about renewable energy, you might explain terms like “solar power” or “wind energy” in simple terms.

Introduce the Topic

Provide an overview of the broader topic you’re addressing. Give just enough information to help the reader understand why the issue is important. For example, “Climate change is one of the most pressing issues facing humanity today, affecting everything from weather patterns to food production.”

Establish the Context

If your essay addresses a problem, it’s important to explain why the issue is relevant and important in the current context. For instance, “With rising temperatures and increasingly frequent natural disasters, scientists have warned that the impacts of climate change will only worsen if action is not taken.”

3. Present Your Thesis Statement

The thesis statement is the central argument or claim you will defend throughout your essay. It’s the most important part of your introduction, as it guides the structure and content of the entire essay.

Be Specific and Clear

Your thesis should be specific and clearly express your position on the topic. Avoid vague statements; make sure your thesis presents a clear stance on the issue. For example, instead of saying “Climate change is bad,” say “Government intervention is crucial in reducing carbon emissions to mitigate the impacts of climate change.”

Make It Debatable

A good thesis statement presents a viewpoint that others could potentially disagree with. This will open the door for further discussion and allow you to present evidence in support of your position. For example, “While some argue that renewable energy is too expensive, the long-term environmental and economic benefits make it the most sustainable solution to the energy crisis.”

Avoid Overgeneralizations

Ensure your thesis is neither too broad nor too narrow. A thesis that’s too broad will be difficult to support with evidence, while one that’s too narrow may not provide enough depth. Find a balance where you can present a focused argument backed by evidence.

4. Make a Smooth Transition to the Body

Once you’ve written your introduction, it’s important to make a smooth transition into the body of your essay. The introduction should naturally lead the reader into the points you will discuss in the body paragraphs.

Give a Preview of Your Main Points

One way to transition smoothly is by briefly outlining the main points or arguments you will cover in your essay. This gives the reader a roadmap of what to expect and prepares them for the evidence you’ll present. For example, “This essay will explore the causes of climate change, the effects on the global ecosystem, and the actions that can be taken to mitigate its impact.”


By following these steps, you’ll be able to craft an introduction that captures your reader’s attention, provides necessary background information, and clearly presents your thesis. A strong introduction sets the stage for a well-organized and convincing essay.

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