Book excerpt: This book provides a comprehensive view of the application of Relational Gestalt theory to Organisation Development and change interventions in organisations. Uncertainty and frequent change are the hallmark of our times. In the field of Organisational Development and Change, fixed methodologies no longer adequately address the uncertainty and uniqueness of today's more complex change situations and more adaptive approaches to change are needed. Gestalt is a relational, dialogic, and emergent approach which means that it views individuals and organisations as embedded in their context, dependent on, and emerging from within a web of relationships and interactions. As such, Gestalt offers a transformative, integral and bespoke methodology for working with this complexity. This approach supports practitioners to attend to their presence, seek out the most pressing issues and mobilise for sustainable change. Gestalt has at its heart the notion of use-of-self as instrument which allows practitioners to be responsive to emergent issues and situations. Relational Organisational Gestalt is at the leading-edge of Gestalt theory and application in organisational settings.