The Boost! Integrated Skills Series encompasses 4 levels and 5 separate strands (reading, writing, listening, speaking and grammar), totalling 20 textbooks. It was designed specifically for younger English language learners who have already progressed through a basic primary/elementary series and need a more advanced approach to learning through skills. Boost! Speaking 3 is part of a 4-level series for junior learners, that develops functional speaking skills like clarification, explanation, description and persuasion.