The conclusion chapter provides the final synthesis of a PhD thesis. It brings together the research problem, objectives, principal findings, contribution and implications of the study and demonstrates how the research has addressed the questions established at the beginning of the thesis.
A conclusion should not repeat the Abstract, Introduction or Results chapter. Its purpose is to draw the research argument together and leave the reader with a clear understanding of what the study has established, what contribution it makes and within what boundaries the findings should be understood.
The structure and terminology of the final chapter vary across disciplines and universities. Some institutions combine the conclusion with recommendations, while others require separate sections for implications, limitations and future research. The university’s approved thesis structure should therefore be considered and followed.
Return to the Research Problem
The conclusion should reconnect the study with the research problem established at the beginning of the thesis. The reader should be able to see that the research has returned to the issue that originally motivated the investigation. A concise restatement of the problem can therefore provide an effective opening. However, the conclusion should not reproduce several paragraphs from the Introduction. Instead, briefly establish the problem and move towards what the research has demonstrated in response.
A useful progression is: research problem → research purpose → principal findings → contribution → implications
Restate the Aim and Objectives
The conclusion should demonstrate whether the overall research aim has been addressed. The objectives can be revisited individually or synthesised thematically, depending on the structure of the thesis. This is particularly important in a doctoral thesis because the examiner should be able to identify connections among: what the study set out to investigate; what was actually investigated; what was found; and what those findings contribute. Avoid copying the objectives from Chapter 1. Instead, connect each objective with the corresponding conclusion drawn from the research.
Synthesize the Principal Findings
The conclusion should identify the findings that matter most to the overall research argument. It is unnecessary to reproduce every statistical result, table or observation. Instead of detailed evidence, interpretation and comparison, the conclusion should instead answer: What are the most important things that can now be concluded from the study? The findings may be presented according to the research questions, objectives, themes or theoretical framework. The emphasis should be on synthesis.
Demonstrate How the Study Answers the Research Questions
An ideal conclusion makes the relationship between the research questions and the final findings explicit. For example, if the study addressed three research questions, then the conclusion should enable the reader to understand how the evidence generated by the study answers each question. The response should remain proportionate to the evidence. If a research question cannot be answered conclusively, then the conclusion should state the limitation clearly.
State the Contribution of the Research
The contribution is central to a doctoral thesis. A contribution may take several forms.
Theoretical Contribution
The study may extend, refine or provide evidence concerning an existing theoretical explanation.
Empirical Contribution
The research may generate evidence from a population, context or setting that has received limited attention.
Methodological Contribution
The study may provide methodological insights or apply an approach that addresses a recognised research limitation.
Practical Contribution
The findings may have implications for professional practice, organisations, education, healthcare, policy or other relevant stakeholders.
Not every thesis will make an equally substantial contribution in every category. The conclusion should identify the contributions that are genuinely supported by the study.
Distinguish Findings from Claims
The conclusion is the point at which overstatement can easily occur. A study may provide evidence of an association without establishing causation. A particular sample may provide valuable evidence without supporting universal generalisation. A conceptual model may be supported within the study without being established as universally applicable. The conclusion should therefore use language that reflects the strength of the evidence.
Useful distinctions include: ‘demonstrates’ – where the evidence directly establishes the stated point; ‘indicates’ – where the evidence provides support; ‘suggests’ – where interpretation is plausible but not definitive; and ‘may contribute to’ – where the broader implication requires further investigation. The appropriate wording depends on the study design and evidence.
Present Theoretical Implications
Where relevant, the conclusion should explain what the findings mean for the theoretical framework. This may involve identifying relationships that were supported, unsupported or modified by the evidence. The theoretical implications should follow from the Discussion rather than introduce a completely new theoretical argument at the end of the thesis. If the study has proposed a conceptual framework, then the conclusion can also explain how the findings relate to that framework.
Present Practical Implications
Practical implications should be based directly on the evidence. For example, research may identify factors that organisations should consider processes that could be improved or areas where additional professional attention may be warranted. Recommendations should be realistic and appropriately bounded. Avoid turning every research finding into a broad policy recommendation. A conclusion is ideal when implications are specific and connected to the evidence.
Address the Limitations
Limitations clarify the boundaries of the conclusions. Relevant limitations may involve research design, sampling, sample size, geographical scope, measurement, data collection, self-reported information, access to data and analytical constraints. The limitations should be linked to their implications for interpretation. For example, if the study was conducted in one geographical setting, the conclusion may clarify that the findings should be interpreted within that context rather than implying universal applicability.
Discuss Future Research
Future research should arise from the unresolved issues identified through the study. Useful directions may involve testing findings in different populations, using longitudinal or experimental designs, examining additional variables, replicating the study in other contexts, applying alternative methodologies and investigating unexpected findings in greater depth. Future research should be specific enough to explain what remains unanswered and why further investigation would be valuable.
Avoid Introducing New Evidence
The conclusion is not the appropriate place for entirely new results, literature or analytical findings. If an important finding has not been discussed earlier in the thesis, introducing it for the first time in the conclusion creates a structural problem. The conclusion should synthesise evidence already established in the thesis. Similarly, new references should generally not be introduced merely to support a point that has not previously been developed. Any necessary literature-based argument should normally be established earlier, particularly in the Discussion.
Maintain Relationship with the Discussion
The Discussion and Conclusion chapters have related but different functions.
| Discussion | Conclusion |
|---|---|
| Interprets individual findings | Synthesises the overall findings |
| Compares findings with literature | Establishes the final research argument |
| Explores possible explanations | States what can reasonably be concluded |
| Develops theoretical interpretation | Summarises theoretical contribution |
| Examines practical meaning | Identifies key implications |
| Discusses unexpected findings | Brings the evidence together |
| Explores limitations | Clarifies the boundaries of the conclusions |
The conclusion should therefore feel like the logical culmination of the Discussion rather than a shorter version of it.
Write a Strong Opening
The first paragraph should establish immediately what the chapter does. It may briefly identify the research problem, the purpose of the study and the overall focus of the conclusion. Avoid beginning with generic statements unless they are directly relevant to the research argument. A direct opening gives the final chapter greater academic authority.
Build Towards the Main Contribution
The most important contribution of the research should not be buried among minor observations. As the conclusion develops, the reader should progressively understand: what problem was investigated; what the research found; what those findings mean; what contribution they make; and what remains unresolved. This creates an intellectual progression.
End with a Meaningful Synthesis
The final paragraph should provide closure. It should not introduce another literature review, an unrelated recommendation or a completely new research question. Instead, bring the thesis back to its central research problem and state what the study contributes to understanding that problem. An ideal ending should leave the reader with a clear sense of the study’s scholarly significance and its appropriate boundaries.
Common Problems in PhD Conclusion Chapters
Avoid:
- repeating the Abstract word for word
- copying the Introduction
- listing every result again
- introducing new findings
- introducing unrelated literature
- making claims stronger than the evidence permits
- presenting recommendations unsupported by the study
- ignoring limitations
- describing generic future research
- failing to state the doctoral contribution
- ending abruptly without a final synthesis.
Final Conclusion Checklist
Before finalising the chapter, check:
- The original research problem has been revisited.
- The research aim has been addressed.
- Major objectives or research questions have been answered.
- Principal findings have been synthesised.
- The research contribution is clearly stated.
- Theoretical implications are appropriately explained.
- Practical implications are evidence-based.
- Limitations are acknowledged.
- Future research directions are specific.
- No major new evidence has been introduced.
- Claims remain within the boundaries of the research design.
- The chapter provides a clear sense of closure.
- The final paragraph reinforces the central contribution.
Conclusion
The conclusion chapter represents the final opportunity to demonstrate the coherence and contribution of the doctoral research. It should bring together the problem, purpose, findings and implications without repeating earlier chapters.
A strong conclusion answers three fundamental questions:
- What was investigated?
- What can be concluded from the evidence?
- What does the research contribute?
When these questions are answered clearly and proportionately, the conclusion provides a convincing final synthesis of the study and establishes the significance of the research within its appropriate academic context.
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