Change management is a structured approach to transitioning organizations from their current state to a desired future state. There are several models of change management including Lewin's unfreeze-change-refreeze model, the ADKAR model with its five building blocks, and dynamic conservatism which explores an organization's inherent resistance to constant change. Organizational change management includes processes for managing the human aspect of change through techniques like creating change strategies, engaging leaders, building awareness, and sustaining changes.