This publication provides common terminologies and definitions to enhance the understanding of public governance, management, and administration. It aims to promote the use of good governance principles and applications in modern government. Set in the context of public service design and delivery and optimization of public sector institutional performance, this handbook further aims to enhance the readers orientation, approach, and understanding of key concepts and meanings in several related functional disciplines. It has a practical and research application, with insights dealing with organizational change and administrative reshaping, transitioning, and repositioning of public sector organizations.