مقایسهٔ روش‌ها

	نمونه‌گیری نظری آنلاین	نمونه‌گیری هدفمند
حوزه	روش‌شناسی پیمایش	روش‌شناسی پیمایش
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	1967 (theoretical sampling); online adaptation ~2000s–2010s	Formalized ~1980–1990
پدیدآور	Glaser & Strauss (theoretical sampling); adapted to online contexts by internet qualitative researchers	Michael Quinn Patton (systematic articulation); roots in early qualitative inquiry
نوع	Qualitative sampling strategy	Non-probability sampling strategy
منبع بنیادین	Glaser, B. G., & Strauss, A. L. (1967). The Discovery of Grounded Theory: Strategies for Qualitative Research. Aldine. ISBN: 978-0202302607	Patton, M. Q. (1990). Qualitative Evaluation and Research Methods (2nd ed.). Sage. ISBN: 978-0803937796
نام‌های دیگر	internet-based theoretical sampling, digital theoretical sampling, web-based theoretical sampling	judgmental sampling, selective sampling, criterion-based sampling, purposeful sampling
مرتبط	4	4
خلاصه	Online theoretical sampling applies the logic of theoretical sampling — selecting participants or data sources based on emerging theory rather than predetermined criteria — within digital environments. Researchers iteratively recruit from online communities, forums, social media, or virtual networks, guided at each step by conceptual gaps identified during concurrent analysis. It is most commonly used in grounded theory studies conducted wholly or partially over the internet.	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.