The fifth edition of Dr. Hall's popular book on rigging math breaks down complex entertainment rigging (theatre and arena) calculations and makes them easy to understand. It also provides hints for remembering many rigging formulas. It is a great resource for anyone studying for either ETCP rigging exam, and includes an explanation of the equations found on the ETCP Certified Rigger - Formula Table. The third edition has a greatly expanded section on arena rigging, as well as more material and appendices for theatrical rigging.