TL;DR: The five qualitative research designs Philippine students most often choose from are phenomenology (shared lived experience), case study (one bounded case), ethnography (a culture or group observed over time), grounded theory (building a new theory from data), and narrative research (one person's story). Each implies a different research question, sample size, and data collection method, phenomenology and narrative studies commonly work with 5-15 or fewer participants, while grounded theory often needs 20-30 to reach saturation. None of these designs rely on statistical tests; that's the domain of quantitative research design instead.
Picking a qualitative design isn't just a Chapter 3 formality, it determines who you'll recruit, how you'll collect data, and how you'll analyze it. This guide walks through the five designs Philippine senior high and college research subjects most commonly draw from, what research question each one actually answers, typical participant counts, and a student-scale example for each. If you're still deciding whether your study should be qualitative at all, start with qualitative vs quantitative research; if you've already landed on quantitative, see quantitative research designs instead.
What Is a Qualitative Research Design?
A qualitative research design is your overall plan for exploring meaning, experience, or process, rather than measuring and testing numerical relationships between variables. It answers "what," "how," and "why" questions about lived experience, culture, or process, in the words and perspectives of the people involved, rather than "how much" or "how strongly correlated" questions.
The five designs most widely taught and used, phenomenology, case study, ethnography, grounded theory, and narrative research, are commonly grouped together following researcher John Creswell's influential framework for qualitative inquiry. Each implies a different unit of analysis (an experience, a case, a culture, a process, a life story) and a different way of collecting and analyzing data.
Disclaimer: design terminology and requirements vary somewhat between schools and advisers. Confirm your program's specific expectations before finalizing your Chapter 3 design choice.
The 5 Qualitative Research Designs at a Glance
| Design | Core Question | Typical Sample | Main Data Collection | Typical Output |
|---|---|---|---|---|
| Phenomenology | What was this shared experience like for those who lived it? | ~5-15 participants who share the experience | In-depth interviews | Themes describing the essence of the shared experience |
| Case Study | What's happening within this one bounded case, in depth? | 1 case (or a few), multiple data sources | Interviews, documents, observation, artifacts | A detailed, holistic account of the case |
| Ethnography | What are the shared patterns, beliefs, and practices of this group/culture? | 1 culture-sharing group, observed over time | Extended observation, participant observation, interviews | A cultural portrait of the group |
| Grounded Theory | What theory or process explains what's happening here? | ~20-30 participants, sampled iteratively | Interviews, constant comparison, coding | A new theoretical model grounded in the data |
| Narrative | How does this person's story unfold, and what does it mean? | 1-3 individuals, in depth | Life-story or narrative interviews, journals, letters | A chronological, interpreted retelling of the story |
Phenomenological Design: When You're Studying Lived Experience
Phenomenology is the right design when your question centers on what a shared experience actually felt like for the people who lived it, not on measuring outcomes, but on describing the essence of the experience itself. It typically draws on in-depth, often multiple, interviews with a relatively small group, commonly cited around 5-15 participants, who all genuinely share the phenomenon being studied.
Student-scale example: A study exploring what it was like for senior high learners to attend fully online classes during a prolonged school suspension, focused on how students made sense of isolation, motivation, and connection to teachers, rather than on their grades, would be phenomenological. The output isn't a number, it's a description of the shared essence of that experience across participants.
Case Study Design: When You're Studying One Bounded Case in Depth
A case study fits when your question is about understanding one specific, bounded case in rich detail, a single school, a single classroom's implementation of a new program, a single organization, rather than generalizing across a population. "Bounded" means the case has clear edges: a specific time period, place, or entity you can point to and say "this is the case."
Case studies typically pull from multiple sources of evidence about that one case, interviews, school documents, observation, and sometimes artifacts, to build a well-rounded, triangulated account. Student-scale example: an in-depth look at how one public high school implemented a new reading intervention program in its first year, covering how teachers adapted it, what worked, and what didn't, is a classic bounded case study. See our full case study format guide for structure and write-up examples.
Ethnographic Design: When You're Studying a Culture or Group
Ethnography is the design for studying the shared patterns, beliefs, language, or practices of a specific culture-sharing group over an extended period, usually through sustained observation and often participant observation, where the researcher spends real time embedded with the group. It answers "what does this group's shared way of life look like, from the inside."
Student-scale example: A study observing how student leaders in a university organization develop and pass down informal onboarding practices to new members over a semester, based on repeated observation of meetings and informal interviews, is ethnographic. It's less common at the senior high level given the time commitment involved, and more common in anthropology, sociology, or education-focused undergraduate and graduate work.
Grounded Theory Design: When You're Building a New Theory
Grounded theory is the right fit when no existing theory adequately explains a process you're observing, and your goal is to generate a new theoretical explanation directly from the data itself, through a systematic process of coding, categorizing, and constant comparison across a relatively larger participant group, often cited around 20-30, sampled iteratively until new interviews stop adding new insight (a point called theoretical saturation).
Student-scale example: A study exploring how first-generation college students in a specific university develop the confidence to stay enrolled despite financial strain, aiming to build a step-by-step explanatory model of that process (not just describe it), would be grounded theory. This is one of the more demanding qualitative designs and is used more often at the graduate level than in undergraduate research.
Narrative Design: When You're Studying a Person's Story Over Time
Narrative research focuses on one or a small number of individuals, retelling and interpreting their story chronologically, often around a specific turning point or arc, drawing from life-story interviews, journals, or other personal accounts. It answers "how did this person's experience unfold over time, and what does that story mean."
Student-scale example: A study following one working student's journey balancing a part-time job and college coursework across an entire academic year, told largely in the student's own words and organized around key turning points, is a narrative study. It's distinct from phenomenology because it centers a small number of individual stories in sequence rather than the shared essence across many participants.
How Many Participants Do Qualitative Studies Actually Need?
Far fewer than most students expect coming from a quantitative mindset, because qualitative research trades sample size for depth. Instead of a target number calculated from a population formula, many qualitative studies use the concept of saturation, the point where new interviews or observations stop revealing meaningfully new information, as the signal that the sample is sufficient.
As rough, commonly cited starting points: phenomenology often works with about 5-15 participants, case studies focus on one case or a handful, ethnography centers on a single group observed over time rather than a headcount, grounded theory frequently uses around 20-30 participants to reach saturation, and narrative studies often feature just 1-3 individuals. These are general guidelines, not hard rules, actual numbers depend on your specific study and what your adviser or program requires.
How to Choose the Right Qualitative Design for Your Study
Work backward from your actual research question, not from which design sounds most sophisticated:
- "What was this experience like for people who lived it?" → Phenomenology
- "What's really going on inside this one specific school/program/organization?" → Case Study
- "What are this group's shared practices, beliefs, or culture?" → Ethnography
- "No theory explains this process yet, can I build one from the data?" → Grounded Theory
- "How did this person's story unfold, and what did it mean to them?" → Narrative
If your draft statement of the problem still uses words like "how much," "how strongly related," or "is there a significant difference," you may actually be looking at a quantitative design instead, check quantitative research designs before locking in a qualitative approach.
Common Mistakes Students Make With Qualitative Design
- Naming a design without matching methods to it. Calling your study "phenomenological" but only handing out a short closed-ended survey doesn't fit; phenomenology needs in-depth interviews.
- Treating sample size the same as quantitative research. Recruiting 100 participants "to be safe" for a phenomenological study usually means shallower data per participant, not a stronger study.
- Skipping a rationale for the design choice. Chapter 3 should explicitly justify why the chosen design, not just any qualitative approach, fits the research question.
- Confusing case study with a survey of multiple sites. A true case study is bounded and deep, not a light look across many locations, that's closer to a comparative or multi-site design.
- Forgetting ethical clearance for interviews and observation. Most schools require informed consent documentation for qualitative data collection involving human participants; build that into your data-gathering timeline early.
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Sources
- Qualitative Inquiry and Research Design: Choosing Among Five Approaches — Creswell & Poth, 4th edition (SAGE)
- DepEd Practical Research 1 Curriculum Guide (SHS)
- SchoolFinderPH — Qualitative vs Quantitative Research
- SchoolFinderPH — Quantitative Research Designs
- SchoolFinderPH — Case Study Format Guide
- SchoolFinderPH — Statement of the Problem Guide
