When the gathering or addition of new data fails to stimulate additional insights, the researcher is experiencing saturation.
Saturation is the term used to describe the moment in data collecting when no new problems or insights are found and data start to repeat, indicating that an appropriate sample size has been achieved.
A researcher can be relatively confident that additional data gathering would provide comparable results and serve to support emergent themes and conclusions when they say they are saturated.
When you hear the same themes emerge frequently during interviews (or observations), this is referred to as saturation in qualitative research.
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