How to Write a Strong Dissertation Purpose Statement (With Examples)

Introduction

Your dissertation problem statement explains why a study is necessary. Your purpose statement tells readers exactly what the proposed study will do. A strong purpose statement names a manageable research intention, identifies the people or material being studied, and points toward a suitable design.

This guide shows how to move from a research problem to a purpose statement, with distinct examples for qualitative, quantitative and mixed-methods dissertations. Always follow your department’s prescribed wording and structure.

What is a dissertation purpose statement?

A dissertation purpose statement is a concise declaration of what the study aims to investigate or accomplish. It normally identifies the central phenomenon or variables, the population or setting, and—where required—the methodological approach.

It describes the investigation, not its anticipated results. Avoid claiming that your study will prove a relationship or solve a problem before evidence has been collected.

Problem statement vs purpose statement vs research question

Problem statement: Why is an investigation needed? Example: It is unclear how undergraduate students in a defined institution use written assignment feedback in subsequent coursework. This is a hypothetical concern requiring supporting literature.

Purpose statement: What will this study examine? Example: The purpose of this qualitative study is to explore how undergraduate students at a specified university describe using written feedback when preparing subsequent assignments.

Research question: What will the study answer? Example: How do undergraduate students at the selected university describe applying written assignment feedback to subsequent coursework?

Keep the key concepts and population consistent across all three. A topic such as “student feedback” alone is not a research problem or a purpose statement.

Step 1: Start from an evidence-supported problem

Write a one-sentence summary of the specific uncertainty, inconsistency or practical concern supported by your literature review. Do not manufacture a research gap merely to justify a preferred method.

Ask: What exactly remains unknown? For whom or where? Why does answering it matter? If you cannot answer these questions, refine the problem before drafting the purpose.

Step 2: Choose an accurate research verb

Qualitative studies often aim to explore, understand or describe experiences, meanings or processes. Quantitative studies may examine relationships, compare groups or estimate associations. Mixed-methods studies should state the purposes of both strands and why combining them is useful.

Choose a verb that matches what the design can actually establish. A correlational survey can examine association; it cannot, by itself, establish causation.

Step 3: Name the focus, population and context

Specify the phenomenon or variables and identify the relevant participants, documents, organisations or other units of analysis. Include a location or setting when it helps define the scope or your institution requires it.

Avoid “students worldwide” when your recruitment plan covers only one university. Do not add demographic restrictions unless they are justified by the research problem and sampling strategy.

Step 4: Make the design visible where appropriate

Some dissertation templates require the opening “The purpose of this [approach/design] study is to…”; others allow a shorter aim. Use the precise label only after deciding on a defensible design.

If your methodology is not yet approved, use a provisional statement and revise it after checking feasibility, data access and supervisor guidance.

Step 5: Check alignment and feasibility

Read the problem, purpose, research questions and proposed methods together. Each should concern the same issue and population. Ask whether the planned data can answer the questions and whether access, time and ethics approvals are realistic.

A purpose statement should not introduce a new outcome that the research questions never address.

Purpose statement templates

Qualitative: “The purpose of this [qualitative design] study is to explore [phenomenon] among [participants] in [setting].”

Quantitative: “The purpose of this [quantitative design] study is to examine the relationship between [variable A] and [variable B] among [population] in [setting].”

Mixed methods: “The purpose of this [mixed-methods design] study is to examine [quantitative focus] and explore [qualitative focus] among [population], integrating the findings to [reason for combining the evidence].”

These are starting structures, not universal institutional requirements. Replace every bracketed element with your approved study details.

Three complete dissertation purpose statement examples

The examples below are hypothetical teaching models, not evidence of actual gaps or completed studies. In your dissertation, replace each proposed problem with one supported by credible literature and tailor the setting, sample and method to your approved design.

Example 1: Qualitative — exploring student experiences

Proposed problem: Written feedback is intended to support learning, yet it may be unclear how first-year students at a particular university interpret comments and decide what to do differently. The existence and importance of this gap must be established through a literature review.

Weak purpose statement: This study will find out why feedback is bad.

Stronger purpose statement: The purpose of this qualitative interview study is to explore how first-year undergraduate students at a selected public university describe the challenges they encounter when interpreting written instructor feedback and applying it to subsequent assignments.

Why the stronger version works: “Explore” matches an inquiry into experiences. The statement specifies the phenomenon (interpreting and applying feedback), participants (first-year undergraduates), context (one public university) and approach (qualitative interviews). It does not pretend that interviews measure how widespread each challenge is.

Aligned research question: How do first-year undergraduates at the selected university describe the challenges of interpreting and applying written instructor feedback to subsequent assignments?

Practical design check: Semi-structured interviews could collect students’ accounts; recruitment, consent, confidentiality and an appropriate qualitative analysis plan would still need to be justified.

Example 2: Quantitative — examining an association

Proposed problem: Existing evidence may not adequately establish whether perceived usefulness of written feedback is associated with academic engagement in a defined undergraduate population. Verify this claim against the literature before using it.

Weak purpose statement: This study will prove useful feedback makes students work harder.

Stronger purpose statement: The purpose of this quantitative cross-sectional correlational study is to examine the association between undergraduate students’ perceived usefulness of written academic feedback and their self-reported academic engagement at a selected university.

Why the stronger version works: It identifies two measurable constructs, a population, setting and correlational design. “Association” is appropriately cautious: a one-time observational survey cannot by itself show that feedback causes engagement.

Aligned research question: What is the relationship between perceived usefulness of written academic feedback and self-reported academic engagement among undergraduates at the selected university?

Practical design check: Define both constructs, choose defensible questionnaire measures, plan sampling and statistical analysis, and consider confounders and limitations of self-report data.

Example 3: Mixed methods — explaining a survey pattern

Proposed problem: Survey findings about feedback usefulness and engagement might reveal a pattern without explaining how students make sense of it. A mixed-methods rationale must show why both numerical and experiential evidence are needed.

Weak purpose statement: This study will use surveys and interviews to study student feedback.

Stronger purpose statement: The purpose of this explanatory sequential mixed-methods study is first to examine the association between perceived feedback usefulness and self-reported academic engagement among undergraduates at a selected university, and then to explore through follow-up interviews how selected students explain the patterns observed in the survey results. The two strands will be integrated to develop a fuller interpretation of the relationship.

Why the stronger version works: The sequence is explicit: survey first, interviews second. Each strand has a distinct purpose, and integration is not an afterthought. The statement does not claim that interviews establish causation.

Aligned research questions: Quantitative: What association exists between perceived feedback usefulness and academic engagement? Qualitative: How do selected participants explain the survey patterns? Integration: How do the interview accounts help interpret the quantitative results?

Practical design check: Plan how interviewees will be selected from survey respondents, how the strands will be connected, and how the results will be integrated. Mixed methods requires more than simply collecting two kinds of data.

Worked transformation: build a purpose statement step by step

Imagine a student wants to investigate how first-year undergraduates use written feedback. This is a teaching example: the proposed gap must be checked against the literature.

1. Broad topic — Written assignment feedback in higher education. This names a subject, not a researchable problem.

2. Proposed research problem — It is uncertain how first-year students at the selected university interpret feedback and use it on later coursework. Verify the uncertainty with credible sources.

3. Narrow the focus — Investigate first-year undergraduates at one university, specifically their interpretation and reported application of written comments.

4. Choose the research intention — Use “explore” because the study seeks students’ accounts, not a causal estimate of feedback effectiveness.

5. Select a suitable approach — Qualitative interviews can investigate experiences and reported decisions, provided recruitment and analysis are feasible.

6. Write the purpose statement — The purpose of this qualitative interview study is to explore how first-year undergraduate students at the selected university describe interpreting and applying written instructor feedback when preparing subsequent coursework.

7. Derive the research question — How do first-year undergraduates at the selected university describe interpreting and applying written instructor feedback to subsequent assignments?

Final check: the problem, purpose and question concern the same students and the same phenomenon. Interviews could answer the question, but they would not establish that feedback raises grades.

Check alignment before you submit

Compare the proposed problem, purpose, question and evidence source. If any element introduces a new population, variable or causal claim, revise it before submission.

Weak versus stronger purpose statement

Weak: “This study will prove that feedback improves all students’ grades.” It presumes an outcome, overgeneralises and fails to specify the population or design.

Stronger: “The purpose of this quantitative correlational study is to examine whether perceived feedback usefulness is associated with self-reported academic engagement among undergraduates at the selected institution.” This identifies a measurable relationship without claiming causation.

Where does the purpose statement go, and how long should it be?

It usually appears in the introductory chapter or proposal after the problem has been established, but placement varies by institution. A sentence or short paragraph may suffice; some templates require a separate “Purpose of the Study” section.

Follow your department’s template and supervisor instructions rather than a universal word-count rule.

Common mistakes to avoid

Confusing the purpose with a broad topic; introducing variables not in the problem; using “prove” when the design cannot prove causality; claiming an unsupported gap; omitting the population or setting; choosing a method before confirming what must be answered; and promising practical changes beyond the study’s scope.

Another frequent mistake is writing a quantitative purpose but asking purely experiential qualitative questions. Check the wording of both before submission.

Final purpose statement checklist

• Can a reader identify exactly what the study will investigate?

• Does the statement follow from a documented research problem?

• Are the central phenomenon or variables clear?

• Are the population and setting appropriately defined?

• Does the action verb match the design?

• Do the research questions and methods match the purpose?

• Does the statement avoid invented findings, unsupported causal claims and exaggerated promises?

• Does it follow the university’s required format?

Final takeaway

A strong dissertation purpose statement is not a grand promise. It is a precise, feasible description of the investigation your study can actually carry out. Start from an evidence-supported problem, choose an appropriate research intention, name the focus and participants, and make sure the questions and methods can deliver the evidence you promise.

Before submitting, ask: Could another researcher understand exactly what I plan to investigate, with whom, and how—and could my proposed data answer the research question? If yes, your purpose statement is doing its job.

Research and editorial references

Westcliff University Writing Center — Dissertation Specific: Prospectus: https://writingcenter.westcliff.edu/doctoral-writing-center/doctoral-support/resources/dissertation-specific-prospectus/

University of Wisconsin–Madison Writing Center — Thesis and Purpose Statements: https://writing.wisc.edu/handbook/processandstructure/thesis_or_purpose/

Westcliff University Writing Center — Dissertation Template Instructions & Supplement: https://writingcenter.westcliff.edu/wp-content/uploads/2025/09/Dissertation-Template-Instructions-Supplement.pdf

Creswell & Creswell (2018), Research Design, excerpt hosted by Westcliff University: https://writingcenter.westcliff.edu/wp-content/uploads/2022/06/Creswell-Creswell-2018.pdf

Editorial note: This article provides general writing guidance. Follow your institution’s dissertation handbook and supervisor requirements. All worked research problems are hypothetical and must be supported by sources before use in an actual dissertation.