This document provides principles and techniques for improving language skills in listening, reading, writing, speaking, grammar, pronunciation, and vocabulary. It discusses exposing students to different types of texts and tasks for listening and reading. For writing, it emphasizes understanding the purpose and audience. Speaking techniques include information gap activities, role-plays and simulations. Grammar instruction should integrate inductive and deductive methods while focusing on communicative use. Pronunciation focuses on intelligibility over perfection. Vocabulary development prioritizes high frequency words and using words in context.