Chapter One: Barcelona Summit Agreement - Mother Tongue plus Two Additional Languages: Developing Plurilingualism through the Education System.- Chapter Two: Key Impediments to Students Achieving their Plurilingual Potential.- Chapter Three: Strategy 1: Cross-age Teaching - Harmonising Post-Primary Modern Foreign Language Classes in Line with the Common European Framework of Reference for Languages.- Chapter Four: Replacing the Current State Modern Foreign Languages Examinations with Common European Framework of Reference for Languages Examinations, Implementing an Academic Tracking System, and Incorporating the European Language Portfolio.- Chapter Five: Strategy 3: Adapting Content and Language Integrated Learning to Support Cross-age Teaching and CEFR Examinations.- Chapter Six: Language Policy and Planning in Post-Primary Schools: Importance, Creation, Implementation, and Review.- Chapter Seven: Barcelona Summit Agreement - Mother Tongue plus Two Additional Languages: It can be Achieved through the Education System.