This chapter applies the methodology of Chapter 1 by presenting a curated repertoire of 48 causal mechanisms, each intended as an SC within its respective domain of social reality. Organized across seven thematic clusters—social macrodynamics, individual resistance and change, collective action, economic growth, capitalism, institutional functioning, and institutional and social change—these mechanisms range from Tilly’s explanation for European state formation to Boyd and Richerson’s theory of success-biased transmission. For each causal mechanism, the chapter explains its logical structure, typical antecedents, operation, and scope, illustrating how isolating these key processes can clarify otherwise intractable social puzzles. A common institutionalist lens underpins the selection: mechanisms are portrayed as processes through which rules, norms, and enforcement structures shape individual and collective behavior. Rather than an exhaustive catalog, the chapter offers a reasoned selection of cases that illustrate how each mechanism operates as a generative process, enabling rigorous causal analysis and practical intervention. By naming each mechanism after its most influential formulators (e.g., Olson, Mann, Hayek), the chapter provides readers with clear references for further study, while maintaining a focus on operational application.