The first edition of the CCPS book Guidelines to Evaluating Vapor Cloud Explosions, Flash Fires and BLEVEs was published in 1994. The second edition was completed in October 2010. It is a major revision of the Guideline with contents completely reorganized, recent research results added, revised and new prediction methods inserted, with sample problems worked for each prediction method. The treatment of pressure vessel burst was expanded and placed in a dedicated chapter, resulting in a new name for the second edition of the Guideline. © 2011 American Institute of Chemical Engineers Process Saf Prog, 2011.