방법 비교

	종단적 비참여 관찰	종단 조사
분야	조사방법론	조사방법론
계열	Process / pipeline	Process / pipeline
기원 연도	Early–mid 20th century (systematized 1920s–1970s)	1940s (panel survey tradition); longitudinal designs codified mid-20th century
창시자	Rooted in sociological field research traditions (e.g., Chicago School); longitudinal extension developed through 20th-century social science methodology	Established tradition; formalized in social science by Paul Lazarsfeld and colleagues (1940s panel studies)
유형	Longitudinal observational data collection	Quantitative / mixed-methods survey design
원전	Angrosino, M. (2007). Doing Ethnographic and Observational Research. Sage Publications. ISBN: 978-1412922173	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922292
별칭	longitudinal unobtrusive observation, repeated non-participant observation, longitudinal systematic observation, extended non-participant field observation	panel survey, repeated-measures survey, longitudinal panel study, wave survey
관련	4	3
요약	Longitudinal non-participant observation is a data collection method in which a researcher systematically watches and records naturally occurring behaviors, interactions, or events at a setting over multiple, repeated observation sessions spanning weeks, months, or years — without joining or influencing the activities being observed. The researcher remains an external observer, producing a time-ordered record of change or continuity in the phenomenon under study.	A longitudinal survey collects structured questionnaire data from the same individuals or units at two or more distinct points in time. By tracking the same respondents across waves, researchers can distinguish genuine change from stable individual differences, establish temporal ordering between variables, and model trajectories of attitudes, behaviors, or outcomes in ways that a single cross-sectional snapshot cannot support.