This essay discusses the challenges and strategies for persuading readers of case-based research. Unlike empirical studies that rely on statistical significance, case studies must convince readers through compelling narratives and conceptual insights. The author argues that a single case can be powerful, as illustrated by the hypothetical scenario of a talking pig. In neurology, case studies of individuals like Phineas Gage have provided significant insights into brain function, despite the non-representative nature of the sample. The author suggests that case studies can be justified if they offer unique insights that larger samples cannot. Case studies are often criticized for non-representativeness, but the author argues that this is not always a flaw. In some cases, the chosen case is special and allows for deeper insights. However, care must be taken to avoid overgeneralizing from a single case. The author also addresses the challenge of justifying case studies by arguing that they should not be seen as merely illustrative but as a means to inspire new theories and provide conceptual insights. The author emphasizes the importance of a strong conceptual argument in case studies. Even if the case is not unique, the conceptual framework should be robust and self-sufficient. The author also highlights the value of case studies in providing concrete examples that help illustrate abstract concepts. This is particularly useful in longitudinal research, where the dynamics of phenomena over time can be better understood through detailed case studies. The author provides examples from his own research, showing how case studies can be used to motivate research questions, inspire new theories, and illustrate conceptual arguments. He argues that case studies should not be seen as merely illustrative but as a means to contribute to theoretical understanding. However, the author warns against overreliance on case studies and emphasizes the need for a strong conceptual argument that stands on its own. Finally, the author argues that case studies should be judged by their conceptual contribution rather than their empirical findings. A valuable case study should provide insights that are not easily obtainable through large-sample research. The author concludes that case studies can be powerful tools for understanding complex phenomena, but they must be grounded in strong conceptual arguments to be persuasive.This essay discusses the challenges and strategies for persuading readers of case-based research. Unlike empirical studies that rely on statistical significance, case studies must convince readers through compelling narratives and conceptual insights. The author argues that a single case can be powerful, as illustrated by the hypothetical scenario of a talking pig. In neurology, case studies of individuals like Phineas Gage have provided significant insights into brain function, despite the non-representative nature of the sample. The author suggests that case studies can be justified if they offer unique insights that larger samples cannot. Case studies are often criticized for non-representativeness, but the author argues that this is not always a flaw. In some cases, the chosen case is special and allows for deeper insights. However, care must be taken to avoid overgeneralizing from a single case. The author also addresses the challenge of justifying case studies by arguing that they should not be seen as merely illustrative but as a means to inspire new theories and provide conceptual insights. The author emphasizes the importance of a strong conceptual argument in case studies. Even if the case is not unique, the conceptual framework should be robust and self-sufficient. The author also highlights the value of case studies in providing concrete examples that help illustrate abstract concepts. This is particularly useful in longitudinal research, where the dynamics of phenomena over time can be better understood through detailed case studies. The author provides examples from his own research, showing how case studies can be used to motivate research questions, inspire new theories, and illustrate conceptual arguments. He argues that case studies should not be seen as merely illustrative but as a means to contribute to theoretical understanding. However, the author warns against overreliance on case studies and emphasizes the need for a strong conceptual argument that stands on its own. Finally, the author argues that case studies should be judged by their conceptual contribution rather than their empirical findings. A valuable case study should provide insights that are not easily obtainable through large-sample research. The author concludes that case studies can be powerful tools for understanding complex phenomena, but they must be grounded in strong conceptual arguments to be persuasive.