What is the name of the sampling method where participants are selected based on insights from previous interviews?

The correct answer is Theoretical sampling. This sampling method is utilized primarily in qualitative research to collect data based on the insights gained from earlier interviews. Researchers engage in an iterative process where existing data informs the selection of new participants, allowing them to explore emerging themes and concepts more thoroughly. Each new participant can provide additional insights that help to develop or challenge the existing theoretical framework, making this method particularly effective for grounded theory studies.

The method sets itself apart from purposive sampling, which focuses on selecting participants based on specific characteristics or criteria rather than insights from previous interviews. This means that while both methods are intentional, theoretical sampling is more fluid and responsive to the data collected as research progresses.