Keith Johnstone er kendt af de fleste inden for teaterverdenen, og hans 20 år gamle bog om improvisation har stadig status af bibel for skuespillere. Søren Rathje, Berlingske Tidende
Since the sixties, Keith Johnstone has led the work on improvisation in theatre, schools and universities.
""Impro" ought to be required reading not only for theatre people generally but also for teachers, educators, and students of all kinds and persuasions. Full of excellent good sense, actual observations and inspired assertions.--"CHOICE: Books for College Libraries."