Theoretical saturation is a foundational concept in qualitative research, particularly within grounded theory and thematic analysis, where it marks the stage at which new interviews or observations cease to generate novel codes, categories, or conceptual insights. Researchers use theoretical saturation as a principled stopping criterion, replacing arbitrary sample size targets with evidence-based judgement about data sufficiency. Reaching theoretical saturation requires iterative data collection and analysis conducted in parallel, so emerging themes can be tested and refined continuously. In enterprise qualitative research, achieving theoretical saturation efficiently is critical because it directly affects project timelines, budget, and the confidence stakeholders can place in the resulting findings.