This book sets an agenda for an ongoing research initiative to solve one of the most vexing problems encountered in security, and includes the following topics: critical IT infrastructure, insider threats, awareness and dealing with nefarious human activities in a manner that respects individual liberties and privacy policies of organizations while providing the best protection of critical resources and services. In some sense, the insider problem is the ultimate security problem. This volume concludes with technical and legal challenges facing researchers who study and propose solutions to mitigate insider attacks.