Comparer des méthodes

	Enquête longitudinale	Observation participante
Domaine	Méthodologie d'enquête	Recherche qualitative
Famille	Process / pipeline	Process / pipeline
Année d'origine	1940s (panel survey tradition); longitudinal designs codified mid-20th century	1922
Auteur d'origine	Established tradition; formalized in social science by Paul Lazarsfeld and colleagues (1940s panel studies)	Bronislaw Malinowski
Type	Quantitative / mixed-methods survey design	Method
Source fondatrice	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922292	Geertz, C. (1973). The Interpretation of Cultures. Basic Books. ISBN: 978-0465026432
Alias	panel survey, repeated-measures survey, longitudinal panel study, wave survey	ethnographic observation, participatory observation, overt observation, immersive observation
Apparentées	3	4
Résumé	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.	Participant observation is a qualitative research method in which the researcher embeds themselves within a community, organization, or social setting for an extended period, engaging in the activities and relationships of the group while systematically observing and documenting behavior, interactions, and cultural meaning. Pioneered by Malinowski in the 1920s and developed in anthropology, the method has been adopted across sociology, education, health sciences, and organizational research. The researcher functions as both insider (participating in group activities) and outsider (maintaining analytical distance), generating thick description—rich accounts of context, behavior, and meaning that reveal how people actually live and interact.