The Headway Fourth Edition Teacher's Book provides full notes for teaching the material effectively, plus lesson hints, suggestions, and 'Possible problems' boxes.
Photocopiable pages give you extra activities and ideas for every unit. The Teacher's Resource Disc has even more resources, including entry checker, tests, CLIL worksheets, a syllabus planner, exam information, typescripts, word lists, and a CEFR language portfolio.