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	Undersökningsforskning	Longitudinell forskning
Ämnesområde	Forskningsdesign	Forskningsdesign
Familj	Process / pipeline	Process / pipeline
Ursprungsår	Late 19th century; methodologically systematised 1940s–1960s	Late 19th–early 20th century; methodologically codified through the 20th century
Upphovsperson	Francis Galton, Charles Booth, and early social statisticians; systematised by Paul Lazarsfeld and colleagues at Columbia in the 1940s	No single originator; foundational methodological treatments by Stuart Menard and Judith Singer & John Willett
Typ	Quantitative (and mixed) non-experimental design	Quantitative (or mixed) observational research design
Ursprungskälla	Fowler, F. J. (2014). Survey Research Methods (5th ed.). Sage Publications. ISBN: 978-1452259000	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922841
Alias	survey methodology, questionnaire research, survey design, survey study	longitudinal study, longitudinal design, prospective longitudinal study, repeated-measures observational study
Närliggande	4	4
Sammanfattning	Survey research is a quantitative (and sometimes mixed-methods) design in which a researcher collects standardised self-report data from a sample drawn from a defined population, using a questionnaire or structured interview. It is the dominant non-experimental strategy for describing population characteristics, estimating prevalence, mapping attitude distributions, and testing bivariate or multivariate associations across social, behavioural, and health sciences.	Longitudinal research is an observational design in which the same participants, groups, or units are measured repeatedly over an extended period. Rather than capturing a single snapshot, it tracks change, stability, and temporal sequencing of variables — making it the primary non-experimental strategy for studying development, growth, decline, and the unfolding of causal processes across time.