This book is atleast 2 years out of date. I was disapointed in the relvance of the topics covered. I will use it as a guide to what areas are on the ISSEP CBK, but I would never consider this the single source to study for the test. I recommend a book called FISMA. Not the ISSEP is only about FISMA, the this book gives better more timely coverage of several domains of study for CISSP-ISSEP.
