Laurence R. Iannaccone's article "Why Strict Churches Are Strong" explores the phenomenon of strict churches and their success in attracting and retaining committed members. Drawing on rational choice theory, Iannaccone argues that strictness reduces free-rider problems by screening out less committed members and increasing participation among those who remain. This approach contrasts with traditional explanations that rely on irrationality, abnormality, or misinformation. The article reiterates Dean Kelley's earlier work, which documented the growth of conservative churches in contrast to the decline of liberal denominations. Iannaccone's analysis extends Kelley's thesis by providing a broader rational choice framework and empirical evidence to support the idea that strictness enhances church strength through increased commitment, participation, and net benefits for members. The study also highlights the importance of adapting strict demands to social change and the existence of an optimal level of strictness to avoid driving away potential members. The findings are supported by statistical analyses and case studies, demonstrating that strictness is a key factor in the success of religious groups across different denominations and cultures.Laurence R. Iannaccone's article "Why Strict Churches Are Strong" explores the phenomenon of strict churches and their success in attracting and retaining committed members. Drawing on rational choice theory, Iannaccone argues that strictness reduces free-rider problems by screening out less committed members and increasing participation among those who remain. This approach contrasts with traditional explanations that rely on irrationality, abnormality, or misinformation. The article reiterates Dean Kelley's earlier work, which documented the growth of conservative churches in contrast to the decline of liberal denominations. Iannaccone's analysis extends Kelley's thesis by providing a broader rational choice framework and empirical evidence to support the idea that strictness enhances church strength through increased commitment, participation, and net benefits for members. The study also highlights the importance of adapting strict demands to social change and the existence of an optimal level of strictness to avoid driving away potential members. The findings are supported by statistical analyses and case studies, demonstrating that strictness is a key factor in the success of religious groups across different denominations and cultures.