Book excerpt: Design and Evaluation of Physical Security Systems, Second Edition, includes updated references to security expectations and changes since 9/11. The threat chapter includes references to new threat capabilities in Weapons of Mass Destruction, and a new figure on hate crime groups in the US. All the technology chapters have been reviewed and updated to include technology in use since 2001, when the first edition was published. Garcia has also added a new chapter that shows how the methodology described in the book is applied in transportation systems. College faculty who have adopted this text have suggested improvements and these have been incorporated as well. This second edition also includes some references to the author's recent book on Vulnerability Assessment, to link the two volumes at a high level. New chapter on transportation systems Extensively updated chapter on threat definition Major changes to response chapter