Introduction to writing a thesis – structure, examples & tips

Many theses fail not because of their methods or results, but right at the beginning with the introduction to a bachelor’s thesis, master’s thesis, or doctoral dissertation.

A weak introduction costs you points, tests your readers’ patience, and often leads to shaky arguments in the rest of the thesis.

Here you’ll learn how to avoid exactly that and what you need to keep in mind when writing your introduction.

What the introduction is really for

The introduction to your thesis has one central task: It answers the question of why your research is needed.

To do this, you guide your readers along the shortest logical path through the relevant literature and toward your research objectives or hypotheses.

  • Our tip: Avoid detours
    Don’t string together anecdotes or take unnecessary detours. Draw a clear line that justifies your research project and makes the added value of your work clear.

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What content belongs in the introduction?

  1. Context & Relevance
    • What is the overarching problem/topic?
    • Why is it practically/theoretically significant?
  2. Core findings: What do we know?
    • 2–4 key findings from the literature (logically linked)
    • Show the conflict or gap—briefly and purposefully.
  3. Gap(s) and objective(s): What don’t we know?
    • Clear, precise, testable (2–4 sentences)
    • Let the hypothesis visibly emerge from paragraphs 2–3
  4. Approach (Plan of Attack)
    • What are you doing at a high level (sample, setting, method)
    • Why does this fit the objective/hypothesis?

Phrases for linking arguments

These words aren’t decoration—they are your proof that you’re arguing.

  • “Therefore…”, “Consequently…”, “For this reason…”, “Thus…”
  • “However…”, “In contrast…”
  • “If… then…”

Create a logical line of reasoning

Before formulating paragraphs for your introduction, it is worth sketching the line of argument in bullet points. This allows you to identify gaps immediately and avoid unnecessary detours.

Example

This line of reasoning sounds absurd, but it is quite instructive (inspired by Moggie et al., 2007):

  • Observation: In living rooms, blue cats often seem warmer than red ones.
  • Explanation A: Blue fur absorbs more infrared radiation – which could explain the warmth.
  • Counterthought: Blue animals may have more mitochondria → higher metabolism.
  • Conclusion: If metabolism is the reason, blue cats should remain warmer even without heat from a fireplace.
  • Hypothesis/Objective: Blue cats are warmer than red ones regardless of infrared sources.
  • Our tip
    Create this path before designing and collecting data. If you cannot formulate it clearly, that shows that your research question or objective is still unclear.
writing a thesis

Why logic is so important

A typical mistake, that keeps happening is introductions that sound like checklists – Lots of interesting facts, but no connection.

To avoid this, ask yourself instead: What argument am I building right now?
Two simple indicators will help you check the logic:

  • Linking words
    Do words such as “however”, “in contrast”, “therefore”, “consequently”, or “for this reason” appear? They are the visible threads of your argument.
  • Sample
    Read your introduction without the sentences referring to previous studies. Does the rest still make sense? If so, you’re probably only describing—you’re not arguing.

Of course, facts can be included: short definitions, brief explanations of a method, a sentence about the significance of the field. But everything should be relevant to the logic—not included for its own sake.

Is your introduction good? Put it to the test!

The best introductions guide readers so that they could predict the planned approach before the final paragraph. So test this:

  • Remove the last sentence containing your formulated goal or hypothesis.
  • Give the introduction to someone uninvolved.
  • Ask them to explain in their own words which experiment/approach is next and why.

If the prediction fits, you have a strong introduction. If not, take another look at your logical progression.

How to justify the need for your thesis

In principle, there are two ways to justify the added value of your work:

  • Relevant research gap
    It is not enough simply that the topic has not yet been studied—novelty is not an end in itself.
    Show why the gap matters (practical relevance, theoretical consequences, methodological advancement).
  • Conflicting findings in the literature
    Several studies arrive at contradictory results? Great—but don’t simply replicate them blindly.
    Formulate a plausible cause for the conflict (e.g., sample, measurement method, context variable) and test it deliberately. This way, you combine existing knowledge with new insights.

Have you read this yet?
Find out how to identify the right research gap for your topic in our article Finding a research gap: A guide for students.

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Long literature review in the introduction?

Basically, no—the introduction to your bachelor’s thesis, master’s thesis, or dissertation is not an extensive literature review. Nevertheless, you need to briefly present the most important previous research so that it is clear why your work is necessary.

Therefore, only summarize the relevant studies that directly lead to your research question.

  • Our tip:
    If your work is a replication, say so openly and explain its added value and why it is important (e.g., larger sample; better control; different context)

Avoid these mistakes in the introduction

  • Write the introduction after collecting the data
  • Have no research question or clear objective
  • The research question/objective is included, but it cannot be derived from your argument
  • Too many facts and too few argumentative connections (therefore/consequently/…)
  • Your discussion is full of “fits Study X/Y” — which you did not prepare in the introduction.
thesis introduction

Practical tip: How to plan it properly

Preparation

  • Create the logical path as bullet points before designing the methodology
  • Formulate research objectives and/or hypotheses from this
  • First, define your research methods

While writing

  • Sketch your initial introduction
  • Describe your research methods
  • Analyze your results
  • Move on to the discussion
  • Our tip
    Write the introduction to your thesis at the beginning. You can refine the language at the end, but in terms of content, it comes before you start.

Conclusion

Your introduction is not a “nice-to-have,” but the steering wheel of your entire thesis.

Find the shortest logical path, make bold connections, explain them clearly – and leave readers almost able to guess what you are about to do.

If this succeeds, the rest of your work will be built on a solid foundation.

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