Abstract
Information and Communication Technology (ICT) is increasingly becoming a part of all critical infrastructures, and thus there is an increasing need to include ICT in all risk assessments. This chapter explains the dependencies between ICT and other infrastructures and provides an overview of the threats and risks associated with ICT. The chapter also gives an introduction to modeling techniques that is of particular use when performing risk analyses of ICT systems. The chapter ends with recommendations on how to include the ICT aspects in risk assessments of other infrastructures.