Augusto Boal, Brazilian popular educator and theater artist, canonized Theater of the Oppressed and his book is the definitive guide to its core techniques.  I consistently draw upon and adapt the Theater of the Oppressed arsenal of exercises to create dynamic facilitation spaces for creative and inclusive problem-solving.   The book is much easier to use after having experienced the exercises as a participant.  I recommend taking a Theater of the Oppressed training for trainers and using this book as a sort of handbook.  Use post-its to jot down your experience with each exercise as well as any ideas you have about how to use specific exercises in your work as a facilitator.  They are unparalleled for facilitating whole group analysis of power in its many forms and to explore how to best wield power for social change.