Theoretical Saturation

Conceptual Overview and Discussion

Theoretical saturation is a speculative construct. A researcher can never be certain that theoretical saturation has been achieved. Researchers can ensure that they have rigorously and systematically explored the research question as comprehensively as possible. They can illustrate their method and analyses, and they can transparently report how the question was informed by the data, including how their understanding of the construct shifted with their analyses through reflexivity. At critical moments, the researcher decides that the material collected, and the theory organizing that material, are not shifting or adding new insights, and the decision that the project is complete and ready for dissemination is made. This is the moment when the researcher believes that theoretical saturation has been approximated. In the end, the judgment of the completeness of the project rests with the audiences who reflect on the process and the theory inducted from that process to concur or disagree as to the theoretical saturation of the research.

Theoretical saturation takes on slightly different meanings according to the type of case study undertaken. A good theory is one that organizes information in ways that provide explanation to other cases. Theory generation is about trying to make a bigger story from particular peculiarities. The idiosyncratic writ large is the theorist's task. The paradox is that no theory can translate onto the individual; however, there are elements of the particular in the universal. The balance is between the individual and the populace. For intrinsic cases, which are studied for their own particular idiosyncrasy, theoretical saturation is approached from the sense of finding as complete a representation of the case as possible. Because intrinsic case studies are pursued for their own sake, saturation would be reached at the point in the research process at which information about the case started to overlap and become repetitive. For instrumental case studies, which are examined for their potential to enhance understanding of an issue or phenomenon, theoretical saturation becomes somewhat more challenging to judge. This is because the actual case is less emphasized than the theoretical insight it might offer toward a construct or concept. In this case, saturation might be inferred when no further theorizing results from the information being collected. To this extent, intrinsic case studies are less likely to be concerned about theoretical significance in their judgments about saturation; instead, they are more likely to be the province of purposeful case studies that are systematically examined so that they can develop or extend theory. When several cases are selected to accomplish this instrumental goal, the study falls into the category of the multiple case study. In this typology, theoretical saturation becomes somewhat easier to judge, because the addition of new cases does not extend the theory in novel ways; instead, new cases can be encapsulated within the theory that has been created through the previous cases.

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