Eighty-five percent of the U.S.’s critical infrastructure, the private sector is in need of improved awareness, education, and training in fulfilling its obligation to maintain vital security interests. This new edition addresses mandates and legislation introduced after 9/11 and since the first edition. It reinforces the U.S. government's investment in infrastructure and national security and emphasizes the private sector’s regulatory requirements. It includes updates to the NIPP (National Infrastructure Protection Plan), new case studies of both proper security policies and procedures in practice versus costly security breaches, a toolkit for improving a company’s security posture, and new measures to assess and address vulnerabilities and threats.