This book presents the Open Educational Model for Complex Thinking (OEM4C), an innovative tool that fosters critical competencies such as systemic, critical, scientific and innovative thinking. Designed for students, teachers and researchers, the model addresses global challenges through open methodologies and emerging technologies, promoting inclusive and sustainable education aligned with the Sustainable Development Goals (SDGs). Through practical scenarios, case studies and digital tools, OEM4C inspires educational transformation that responds to the needs of a changing world.