The document discusses several prominent models and theories of organizational development and change management. It describes Kurt Lewin's force field analysis model which involves three stages - unfreezing, moving, and refreezing. It also outlines Ronald Lippitt's seven stage model of change and Burke and Litwin's model distinguishing first order incremental change from second order transformational change. Finally, it introduces systems theory concepts like interrelated parts, exchange of information, and equifinality and discusses using force field analysis to drive behavior change.