This document summarizes the lexical approach to language teaching developed by Michael Lewis in the 1990s. The lexical approach focuses on developing students' proficiency with vocabulary, including individual words, multi-word units, collocations, and sentence frames. It aims to provide scaffolding for students and make the teacher's language the main input source. Students are encouraged to observe and classify real language samples to discover patterns themselves. The advantages are that it encourages and motivates students through a step-by-step process, and teachers feel more comfortable with a clearly defined curriculum. The disadvantages are that language cannot be perfectly divided and some topics considered advanced can actually be taught at lower levels.