TALE Project Handbook is a comprehensive training resource designed to improve language assessment literacy (LAL) among English Language Teaching (ELT) teachers. It provides innovative online and paper-based LAL training materials developed through empirical research and pilot testing across multiple European countries. The handbook focuses on practical, flexible, and reflective teacher training methods, facilitating self-paced study or integration into university programs. It addresses the need for valid, fair, and well-designed language assessment and promotes enhanced assessment knowledge and skills among pre-service and in-service teachers, aiming to improve assessment practices and teaching quality in language education globally.