Action research is one of the most popular methods of professional development for teachers. It provides a practical way for teachers to uncover some of the complexities of the teaching process and thereby improve the quality of their pupils' learning. "Teachers Investigate Their Work" introduces the methods and concepts of action research through examples drawn from studies carried out by teachers. The book is arranged as a handbook with numerous sub-headings for easy reference and fourty-one practical methods and strategies to put into action, some of them flagged as suitable 'starters'. Throughout the book, the authors draw on their international practical experience of action research, working in close collaboration with teachers. It is an essential guide for teachers, senior staff and co-ordinators of teacher professional development who are interested in investigating their own practice in order to improve it.