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	Adaptivt ändamålsenligt urval	Syftesbaserad urval
Ämnesområde	Surveymetodik	Surveymetodik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1980s–1990s	Formalized ~1980–1990
Upphovsperson	Rooted in Patton's purposive sampling typology; adaptive dimension from iterative qualitative inquiry traditions	Michael Quinn Patton (systematic articulation); roots in early qualitative inquiry
Typ	Qualitative sampling strategy	Non-probability sampling strategy
Ursprungskälla	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711	Patton, M. Q. (1990). Qualitative Evaluation and Research Methods (2nd ed.). Sage. ISBN: 978-0803937796
Alias	iterative purposive sampling, emergent purposive sampling, adaptive qualitative sampling, dynamic purposive sampling	judgmental sampling, selective sampling, criterion-based sampling, purposeful sampling
Närliggande	5	4
Sammanfattning	Adaptive purposive sampling is a qualitative strategy in which the researcher begins with explicitly stated, theory-driven selection criteria and then deliberately revises those criteria as data collection proceeds and new understanding emerges. Unlike fixed purposive sampling — where criteria are locked in before fieldwork — the adaptive variant treats the sampling frame as a working hypothesis that is refined in response to early findings, enabling the study to follow the evidence into unexpected but analytically important directions.	Purposive sampling is a non-probability strategy in which the researcher deliberately selects participants, documents, or cases that are information-rich with respect to the research question. Rather than drawing units at random, the researcher applies explicit criteria aligned with the study's purpose, maximising the depth and relevance of the data collected. It is the default sampling logic in most qualitative research designs and is also used in mixed-methods and applied evaluative work.