เปรียบเทียบวิธี

	ภาพรวมการวิจัยเชิงคุณภาพ	วิธีการเก็บรวบรวมข้อมูล
สาขาวิชา	ระเบียบวิธีวิจัย	ระเบียบวิธีวิจัย
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1900	1980
ผู้ริเริ่ม	Ethnographers (Boas), grounded theorists (Glaser & Strauss, 1967), phenomenologists, and interpretivists (1900s–1980s)	Floyd Fowler (surveys); John Creswell, Robert DeVellis (qualitative and scale methodology)
ประเภท	Framework	Framework
แหล่งต้นตำรับ	Creswell, J. W. (2017). Qualitative Inquiry and Research Design: Choosing Among Five Approaches (4th ed.). SAGE Publications.	Fowler, F. J. (2014). Survey Research Methods (5th ed.). SAGE Publications.
ชื่อเรียกอื่น	qualitative inquiry, exploratory research, interpretive research	data gathering, measurement instruments
ที่เกี่ยวข้อง	3	3
สรุป	Qualitative research is a systematic inquiry into human experiences, meanings, behaviors, and contexts using non-numerical data (words, text, images, observations). Unlike quantitative research, which seeks to measure variables and test hypotheses numerically, qualitative research prioritizes depth, contextual richness, and understanding of 'how' and 'why.' Major approaches include phenomenology (lived experiences), grounded theory (theory development from data), ethnography (cultural understanding through immersion), case study (in-depth investigation of a specific case), and narrative inquiry (personal stories). Creswell (2017), Braun and Clarke (2006), and Patton (2015) provide contemporary frameworks for qualitative design, data collection, and analysis.	Data collection methods are the specific techniques and instruments used to gather information from research participants or sources. Common quantitative methods include surveys (questionnaires, interviews), physiological measurements (blood pressure, lab assays), behavioral observations, and administrative/secondary data (e.g., medical records, national registers). Qualitative methods include in-depth interviews, focus groups, observations, and document analysis. Selection and design of data collection instruments directly affect data quality, validity, and reliability. Floyd Fowler's work on survey methodology (1980s–2010s), Robert DeVellis's scale development approach, and John Creswell's frameworks for qualitative data collection provide systematic guidance.