How has evolved the conception of corporate managers about the role of a corporate parent regarding its divisions?

Question

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The Answer is Two decades ago most of the emphasis was on managing large business empires, and controlling divisions.
This conception has recently shifted to value creation, and to the identification and the construction of the means to do so.
Corporate parenting was substituted to corporate control, and reflects that shift.
Changes in corporate management perspective include decentralization of decision-making closer to the markets and lower within division levels, a shift from formal to informal coordination, and a more complete and elaborate role for corporate management. Top corporate managers help divisions by acting as service centers, guides for the future, and a knowledge and competencies hub, to collect, encode, enrich, and diffuse resources and capabilities.
General guidance encompasses managerial help for change, strategic direction, organizational structure change, contribution to a firm's general efficiency, and developing flexibility, integration, and coordination.
Three fundamental roles of corporate management must be performed for the entire firm: the entrepreneurial process, the integration process, and the renewal process.

How Has Evolved the Conception of Corporate Managers About the Role