Conceptual Saturation
The point in reviewing literature at which additional sources yield no new concepts, themes, or arguments.
Conceptual saturation is the point at which reading further sources stops producing new concepts, themes, or theoretical positions. New papers keep appearing, but they repeat arguments, methods, and findings you have already mapped. The idea parallels saturation in qualitative data collection, where sampling stops once new cases add no new insight.
Saturation gives you a principled answer to the hardest practical question in a literature review: when to stop searching. Without it, reviewing can expand indefinitely and consume months of a thesis timeline. Track the concepts each new source contributes, for example in a synthesis matrix; when several consecutive sources add nothing, you have evidence of coverage you can describe in your methodology. Saturation is provisional, though, so recheck the literature for significant new work before submission.
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