When Weber used the concept rationality he had in mind?

When Max Weber referred to rationality, he primarily focused on the idea of "formal rationality," which emphasizes efficiency, calculability, and predictability in decision-making processes. He contrasted this with "substantive rationality," which is grounded in values and ethical considerations. Weber's exploration of rationality was central to his analysis of modernity, specifically how bureaucratic structures and capitalism embody formal rationality, shaping social actions and institutions. Overall, Weber's concept highlights the tension between rational efficiency and human values in societal development.