This handbook offers a compass for educators and leaders navigating the complexities of optimizing learning environments, technology integration, and evaluating innovation. Drawing from a decade-long OECD initiative, the handbook delves into four key chapters, unpacking learning principles, innovative environment frameworks, leadership strategies, and evaluative thinking. It's a practical guide enriched by OECD's extensive research, steering away from technical jargon to provide accessible tools for educators globally. By encapsulating the essence of the Innovative Learning Environments project, this resource doesn't just analyze change; it empowers educators and administrators worldwide to actively innovate within their educational landscapes. As emphasized by Andreas Schleicher, OECD's Director for Education and Skills, involving teachers and local stakeholders in the design, not just the implementation, is the pivotal lesson in driving educational innovation forward.