How to Tie Your Discussion and Conclusion Chapters Together in a Doctoral Dissertation

By the time doctoral students have completed their discussion chapter, most of the intellectual work is done: the data has been analyzed and the findings have been interpreted. What remains unclear for many candidates at this stage is not a lack of insight, but genuine ambiguity about how the discussion and conclusion chapters relate to one another, and where the line between them belongs.

Still working on the discussion chapter itself? See our guide to structuring a thesis discussion chapter first.

When you clearly define the differences between thesis discussion and conclusion chapters before you begin drafting either one, you avoid the most common structural problem examiners report when reviewing candidates' discussion and conclusion chapters: a conclusion chapter that essentially restates the discussion chapter in a shorter format, adding little to no new content.

Why the distinction matters at the doctoral level

Master's theses sometimes combine discussion and conclusion into a single chapter. Doctoral dissertations, by contrast, almost always keep these as separate chapters. One of the main reasons for this separation is that a PhD is meant to demonstrate not just a student's ability to interpret their own findings, but also their ability to step outside their own study and describe its relevance within the larger academic discipline.

The primary function of the discussion chapter is to perform the interpretation. The primary function of the conclusion chapter is to synthesize the discussion into a cohesive picture and position it within the larger academic discipline. When these two functions are collapsed into a single chapter, or are not clearly differentiated across two separate chapters, a student quickly signals to a committee that they have not yet achieved doctoral-level scholarly judgment.

What the discussion chapter is responsible for

To write an effective conclusion chapter, you need to clarify what belongs in the discussion chapter. Most of the time, confusion about what belongs in the discussion chapter creates confusion about what belongs in the conclusion chapter.

Typically, the discussion chapter performs the following tasks: interpretation of each major finding relative to your research questions or hypotheses; comparison of your findings to prior literature and explanation of how your findings confirm, contradict, or expand upon prior literature; explanation of possible causal factors behind your results; identification of the limitations of your study and how those limitations affect interpretation of your results; and analysis of your findings in roughly the same order as they were described in your results chapter.

The discussion chapter is very detail-oriented. It analyzes each finding separately and in depth, closely examining the details of your data and methodological processes.

What the conclusion chapter is responsible for

Unlike the discussion chapter, which examines findings one by one in detail, the conclusion chapter takes a big-picture view. It identifies what your collection of findings contributes as a whole, and then determines what should happen next in terms of research or application.

A typical way to organize a doctoral dissertation final chapter for concluding is as follows: a generalization or synthesis of your key findings, stated at a higher level of abstraction than in your discussion chapter; a clear description of the overall contribution your study made to theory, practice, or both; an explicit connection back to the original problem statement and justification provided in Chapter 1; any applicable practical or policy implications based on your findings; clearly articulated recommendations for future research that are supported by your study; and a final closing statement that leaves readers with a clear understanding of the value represented by your work.

As you can see, this list omits several items, including a lengthy section walking back through individual findings with additional interpretation. That task was already performed in your discussion chapter. Repetition of this nature in condensed form is likely the single most frequent error examiners flag in conclusion chapters.

Synthesizing findings thesis-wide: the core function of the conclusion chapter

Synthesizing research findings thesis-wide means taking individualized results and combining them into an overarching story that tells how they fit together. The core skill required to effectively write a conclusion chapter is integrating individualized results into a cohesive story, rather than simply listing individual results one after another as they appeared in your results chapter.

Consider the difference between two approaches to listing your findings at the beginning of your conclusion chapter. Repetition (weak): "RQ1 determined that individuals receiving intervention demonstrated significant decreases in anxiety scores. RQ2 indicated that intervention effects were influenced by initial levels of symptoms. RQ3 demonstrated that effect size remained consistent over time." Synthesis (strong): "Together these findings indicate that interventions produce statistically significant reductions in symptoms related to anxiety, lasting over time. Effects were greatest for individuals entering treatment with greater symptom severity, an important consideration for clinical applications going forward."

In contrast to listing individual findings as separate facts in isolation from one another, the synthesized example treats individualized findings as parts of a larger argument. This distinction, interpreting findings as separate facts versus using individualized findings as part of a larger argument, defines what constitutes a doctoral-level conclusion as opposed to simply repeating material.

Step 1: Develop synthesis prior to creating transitional phrases

Prior to writing any transition phrases between paragraphs or sections, list your key findings on one page, removed from statistical detail, and ask yourself: what is the one-to-two sentence story told collectively by these findings? The synthesis statement generated in response to this question will serve as the base upon which you build the remainder of your concluding chapter.

Step 2: Establish a direct connection between the original problem and the study

Your concluding chapter must establish a direct link between your original problem as defined in Chapter 1 and close the loop created by your entire dissertation. Be sure to explicitly state how your collective findings address the gaps or issues you initially defined. While many student drafts implicitly create this connection, making it explicit is necessary for readers who do not regularly reread Chapter 1 while reviewing your conclusion chapter.

Step 3: Describe the contribution specifically

Do not make vague contribution statements such as "this study contributes to existing literature." Instead, describe specifically what type or types of contributions your work makes. Did you extend existing theory to new populations or contexts? Do you resolve contradictions present between past studies? Did you develop new methodologies, frameworks, or tools? Did you provide empirical support for assumptions previously unstudied? Clearly defining precisely what type of contribution you make demonstrates that you recognize your work's location within the larger academic discipline, an exact aspect that committees evaluate when reviewing doctoral work.

Step 4: Identify implications and recommendations separately

Most concluding chapters confuse practical implications (the meaning that can be inferred from your collective findings concerning practice or policy, based on what you discovered) with recommendations for further study (the aspects that remain unclear). Identify implications separately from recommendations. Implications derive from what you already know; recommendations derive from what you don't know.

Step 5: Identify recommendations that are specific and supported

Recommendations for future study similar to generic recommendations (e.g., "future researchers should collect data from a larger number of participants") are common but weak. A strong recommendation will connect directly to a particular limitation or finding from your study and explain why recommending that particular direction is important.

Weak recommendation: "Future studies should collect data from more participants." Strong recommendation: "Since this study's sample consisted solely of clinical participants recruited from urban locations, future researchers should replicate this design in rural or community-based locations so they can assess whether observed effects generalize beyond this population."

Step 6: Create a final closing statement that closes

Close your dissertation with a final paragraph that supports the importance of your work without providing new information or excessive hedging. This is your final chance to communicate clearly to your committee, and any future reader, what was accomplished by your work.

Common mistakes that blur the discussion-conclusion boundary

Restating discussion content nearly verbatim. If your conclusion chapter could be produced by copying sentences from your discussion chapter and shortening them, the synthesis work has not actually happened. Every sentence in your conclusion should operate at a higher level of abstraction than its counterpart in the discussion.

Introducing new findings or analysis late. The conclusion chapter is not the place to introduce a new interpretation of your data that did not appear in the discussion chapter. New analytical content at this stage suggests disorganized drafting and can raise questions during your defense.

Vague, interchangeable recommendations. Recommendations that could apply to nearly any study in the field ("more research is needed," "future studies should use diverse samples") do not demonstrate the specific scholarly judgment a doctoral conclusion should show.

Overclaiming the study's impact. Just as in your significance section in Chapter 1, avoid closing your dissertation with claims that outpace what a single study, however well executed, can reasonably support.

Think of your discussion chapter as the detailed evidence and your conclusion chapter as the closing argument built from that evidence. A jury does not want the closing argument to simply repeat every piece of testimony again. They want it synthesized into a clear, persuasive case for what it all means. Your dissertation committee is looking for the same thing: not another pass through your data, but a confident, well-organized statement of what your work contributes and where the field should go from here.