Improvisation for the Theater
Northwestern University Press - 15.95 USD
This work is a bit older than Johnstone`s and it shows, even though the latest reprint has been revamped and a bunch of new games have been added. Spolin (and her son Paul Sills) is for America what Keith Johnstone is for Europe.
The book is less profound than Johnstone`s Impro (although it does contain a whole chapter on theory) and is far more oriented towards Theatre in general. That is probably due to the fact that Spolin started experimenting in the 40s, about 10 years before Johnstone started his work. This book was a bit the Bible for Second City in Chicago in the 50s. Although Second City was founded about the same time Johnstone founded his Theatre Machine (and later Loose Moose), this book really covers the fundamentals, which for Spolin really originated out of a theatre education, and all that dates from before the Era of Improv.
What happened after 1958 is a bit missing in this book. It contains an enormous list of games, but all these are really very basic. This book is like the Bible for Christians, it may sound a bit outdated, but it is still a must have.