Sequential Case-Focused Mixed Methods — Sequential Case-Focused Mixed Methods Design
Also known as: sequential case study mixed methods, case-focused sequential design, sequential mixed case design, SCFMM
Sequential case-focused mixed methods design combines the depth of case study methodology with the phased data-collection logic of sequential mixed methods. Quantitative and qualitative data are gathered in distinct, ordered phases — either QUAN then QUAL or QUAL then QUAN — and both strands are anchored within one or more bounded cases. The design is suited to research questions that require understanding how and why phenomena unfold within specific real-world contexts.
Key highlights
- Combines the contextual depth of case study with the evidential range of mixed methods, producing findings that are both contextually grounded and methodologically robust.
- The sequential logic means each phase builds directly on the previous one, making the rationale for data-collection decisions transparent and auditable.
- Allows the unit of analysis to remain fixed on the case while varying the data type, so quantitative and qualitative insights speak to the same bounded phenomenon.
- Particularly powerful for programme evaluation and organisational research, where understanding both outcomes and processes within specific contexts is essential.
- Supports a clear integration point that prevents the two strands from becoming independent parallel studies.
Intuition
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How it works
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When to use it
Use this design when the research question requires understanding a phenomenon in depth within a specific real-world context and when different types of data are needed sequentially to build that understanding. It is appropriate when a first-phase result (statistical pattern, exploratory theme, or anomaly) raises a question that only the complementary strand can address. The design is well suited to programme evaluation, organisational research, health services research, and educational studies where context is theoretically important. Do not use it when the research question is purely distributional (a survey suffices), when time or resources preclude two full data-collection phases, or when the case boundaries cannot be meaningfully defined — in such situations a single-strand design or a concurrent mixed methods design is more appropriate.
Strengths & limitations
- Combines the contextual depth of case study with the evidential range of mixed methods, producing findings that are both contextually grounded and methodologically robust.
- The sequential logic means each phase builds directly on the previous one, making the rationale for data-collection decisions transparent and auditable.
- Allows the unit of analysis to remain fixed on the case while varying the data type, so quantitative and qualitative insights speak to the same bounded phenomenon.
- Particularly powerful for programme evaluation and organisational research, where understanding both outcomes and processes within specific contexts is essential.
- Supports a clear integration point that prevents the two strands from becoming independent parallel studies.
- Requires substantial time: two full data-collection and analysis phases must be completed before the study is finished.
- Findings are contextually bound to the selected cases and are not statistically generalizable to a broader population.
- The quality of the second strand depends heavily on the quality of the first-strand analysis and the integration decision; a weak integration point undermines the entire design.
- Defining and bounding the case can be conceptually difficult, particularly in multi-site or multi-level studies.
- The researcher needs competence in both quantitative and qualitative methods — weaknesses in either strand compromise the study.
Common pitfalls
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Applications
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Frequently asked
What is the difference between sequential case-focused mixed methods and the standard explanatory sequential design?
Both use a QUAN-then-QUAL sequence, but the standard explanatory sequential design typically samples from a population and selects follow-up participants based on statistical results. The case-focused variant fixes the unit of analysis on one or more bounded cases from the outset — both strands are anchored within the same case(s), which are chosen for their contextual relevance rather than their statistical representativeness.
How many cases should I include?
A single case is defensible when the case is theoretically unique or revelatory. Two to four cases support cross-case comparison and are common in mixed methods case work. More than six cases can become unwieldy in a sequential design because the depth of two-strand analysis must be maintained for each case. The key criterion is whether each case is bounded, relevant, and manageable given the sequencing requirement.
Can the QUAL strand come first?
Yes. The design accommodates either QUAL-first or QUAN-first sequencing depending on the research question. If preliminary qualitative exploration of the case is needed to develop meaningful instruments or identify hypotheses, a QUAL-first approach is appropriate. The defining feature is that the strands are sequential and that the integration point between them is explicit and purposive.
How is integration achieved in practice?
The most common integration strategy is a joint display — a matrix or figure that places first-strand findings alongside second-strand data for the same case, enabling direct comparison. Another approach is using first-strand results to purposively sample participants or sites for the second strand. The integration rationale and decisions should be documented in the methods section, not treated as implicit.
Is this design appropriate for a dissertation?
It is feasible but demanding for a dissertation. The sequential timing means the project cannot proceed to phase two until phase one is complete and analysed, which compresses the timeline. Students should negotiate the scope carefully — typically a single case or a small set of two cases — and have clear IRB approval covering both phases before data collection begins.
Sources
- 1.Creswell, J. W., & Plano Clark, V. L. (2018). Designing and Conducting Mixed Methods Research (3rd ed.). Sage.ISBN 978-1483358307
- 2.Yin, R. K. (2006). Mixed methods research: Are the methods genuinely integrated or merely parallel? Research in the Schools, 13(1), 41–47.
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Cite this page
ScholarGate. (2026, June 3). Sequential Case-Focused Mixed Methods. ScholarGate. https://scholargate.app/research-design/sequential-case-focused-mixed-methods