Principle to Practice - Follow the Blue Line is a fundamental human performance improvement book that every manager should read. The book is a GPS for building a safety framework that prevents errors with organizational structure. In the book, David Lynn teaches readers 25 real-world practices that can be used to minimize mistakes that lead to injuries. Designed as a resource for safety leaders and managers, the book will help readers build a successful safety framework, influence human performance, change safety attitudes, and build a safety culture at your company.