Part 1: Introduction 1. Introduction: Vocabulary and the Four Skills - Current Issues and Future Concerns Part 2: Listening 2. Vocabulary and Listening - Current Research, Tools, and Practices 3. Vocabulary Learning through Listening: Which Words are Easier or More Difficult to Learn and Why? 4. Vocabulary and Listening 5. Vocabulary and Listening - Future Research, Tools, and Practices 6. Vocabulary and Reading - Current Research, Tools, and Practice 7. Building Vocabulary Knowledge from and for Reading - Ways to Improve Lexical Quality 8. The Validity of The Tem-4 as a Measure of Vocabulary Knowledge and Reading Comprehension 9. Vocabulary and Reading - Future Research, Tools, and Practices Part 4: Speaking 10. Vocabulary and Speaking - Current Research, Tools, and Practices 11. Investigating the Extent to which Vocabulary Knowledge snd Skills can Predict Aspects of Fluency for a Small Group of Pre-intermediate Japanese L1 Users of English L2 12. Re-examining the Relationship between Productive Vocabulary and Second Language Oral Ability 13. Vocabulary and Speaking - Future Research, Tools, and Practices Part 5: Writing 14. Vocabulary and Writing - Current Research, Tools, and Practices 15. Specialised Vocabulary in Writing: Looking Outside ELT 16. Lexical Development Paths in Relation to Academic Writing 17. Vocabulary and Writing - Future Research, Tools, and Practices Part 6: Conclusion 18. Conclusion: Vocabulary and the Four Skills - Pedagogy and Practice