Systems Thinking and Action Research for Innovation introduces the Process Oriented Holonic (PrOH) Modelling Methodology, a novel systems thinking methodology, combining academic rigor with practical guidance for conducting action research in organisations. It equips readers to conduct high-impact research and drive systemic transformation.Readers will gain a comprehensive understanding of systems thinking and action research, with a focus on the innovative PrOH Modelling Methodology. This book provides detailed practical rules and guidelines, enabling readers to apply the PrOH Modelling Methodology effectively in action research projects. Engaging exercises and mini tests throughout the text help reinforce learning, while visually striking diagrams illustrate key concepts in an accessible manner. Real-world case studies from industries such as manufacturing, supply chain, legal and public services demonstrate the practical application of PrOH Models, offering insights into systemic success factors, process improvements and innovations. Reflections on theory link practice to foundational principles, ensuring readers develop theoretical, methodological and practical expertise. Additionally, the book explores advanced topics such as building holarchies, gamification, and the future of holonic thinking, making it a definitive systems thinking and action research guide for academics and practitioners alike.This book is intended for postgraduate students, doctoral researchers, and management consultants specializing in organisational change, technical innovation and process improvement.Additional resources are available from an author-maintained companion website dedicated to PrOH Modelling: https://prohmodel.org/