ALTERNATE COVER EDITION Seasoned improvisers CAROL SCHINDLER and TOM SOTER share the lessons of improv learned during 30 years of performing and teaching improvisation. "This is a great teaching tool," says Master Teacher Rob McCaskill. "It will remain a document of our time and will be read by actors and improvisers for decades to come " Adds screen star Mark Ruffalo ("The Avengers"): "I highly recommend this book to anyone who is starting out or who is still on the path to knowledge " Finally, Hal Linden (Broadway star and also on TV's "Barney Miller"): "I wish I had this book when I was...