With over 25,000 copies sold since its first edition, this book provides an unrivalled introduction to the core concepts and basic techniques of transactional analysis (TA).

The fantastic first book in the Sunday Times bestselling Science of Discworld seriesWhen a wizardly experiment goes adrift, the wizards of Unseen University find themselves with a pocket universe on their hands: Roundworld, where neither magic nor common sense seems to stand a chance against logic.