Book excerpt: Far more than simply an overview of improv comedy, this book helps actors, writers and comedians learn the basics as taught in all the major comedy schools. First, the do's and don'ts of the Comedy Improv Commandments. The concepts that, when understood, hit the student like falling anvils: Anvil 1: Collaboration -- Working with the 'Group Mind', Anvil 2: Agreement -- 'Just say Yes', Anvil 3: Foundation -- 'Who, What and Where, Anvil 4: Exploring -- 'Finding the Game'. Successful improv requires the skill of the actor, the talent of the comedian and the ideas of the writer rolled into one. This book tells how it can all be done for performers or teachers.