Fully updated edition with five brand new sessions and bonus features. Fully updated with new developments in the theory and practice of teaching philosophy, this new edition of the bestselling book, The If Machine, presents 30 clear, ready-to-use plans to teach philosophy in the classroom with children aged five to 13. Each tried-and-tested session offers an imaginary situation, followed by a series of questions to encourage children to challenge key philosophical ideas such as values and ethics, gender and identity, and existence and beauty. With a star system indicating the level of difficulty, this practical book by Peter Worley, founder of The Philosophy Foundation, outlines Peter's philosophical enquiry method, which he has developed over 20 years of teaching. This fantastic resource also includes a new hints and tips section, as well as a troubleshooting table with guidance and links to further resources about how to deal with common problems such as unanimity. Accompanied by a companion website featuring an introduction to the philosophy that inspired the ideas, The If Machine is a must-have resource for all classrooms.