For us, Legitimation Code Theory (LCT), and in particular its concept of semantic waves, has been one of those how-did-we-ever-teach-without- knowing-this theories. It has shifted our approach to teaching EAP, infiltrating every lesson plan and all the materials we create. And we’re pretty sure that with the theory’s lynchpin, Karl Maton, Riding the waves to academic success Richard Ingold and Daniel O’Sullivan explain how understanding semantic waves can help students improve their writing. giving a plenary at BALEAP 2017, its influence is set to grow and grow. So what exactly is LCT? What is a semantic wave? And how can this idea help students produce better