This chapter offers intertwined conceptual frameworks to illuminate how diverse causal mechanisms drive institutional change. It begins by distinguishing four mechanism types—macro-to-micro, micro-to-micro, micro-to-macro, and macro-to-macro—showing how broad social forces shape individual beliefs and actions, how individuals influence one another, and how their collective behavior feeds back into larger structures. Next, it examines the interplay among ideological, political, economic, and coercive power, revealing systemic tensions within hybridized power configurations. It then explores the dynamic balance between community (security and solidarity) and society (freedom and individualism), demonstrating how institutional arrangements negotiate this trade-off. Subsequently, it presents a co-evolutionary model in which psycho-social factors—such as fear, regret, and trust—permeate institutional layers, synchronizing changes across domains and generating polycrisis. Finally, it discusses how these frameworks can be elaborated into middle-range theories, outlining the methodological steps to transform conceptual “blueprints” and causal “bricks” into empirical, testable models. By integrating these frameworks and pointing toward theory construction, readers gain tools to trace standalone mechanisms, their interactions, feedback loops, and emergent patterns, equipping them to analyze and anticipate complex trajectories of institutional transformation.