longitudinal research
observational methods
Delphi technique
comparative research
ethnography
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qualitative data collection
qualitative research
oral history research
pilot studies
methods
vignette
cross-national research
case studies
photo elicitation
biographical research
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secondary data analysis
autoethnography
non-participant observation
field studies
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documentary research
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feminist research
secondary research
poststructuralism
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unobtrusive measures
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ethnomethodology
surveys
interviews