Book excerpt: This book aims to help policy makers, stakeholders, practitioners, and teachers in psychology and education provide more effective interventions in educational contexts. It responds to disappointment and global concern about the failure to implement psychological and other interventions successfully in real-world contexts. Often interventions, carefully designed and trialed under controlled conditions, prove unpredictable or ineffective in uncontrolled, real-life situations. This book looks at why this is the case and pulls together evidence from a range of sources to create original frameworks and guidelines for effective implementation of interventions.