The development of methods for the monitoring and assessment of structures has been driven by the demand for better as well as cheaper methods. Constraints like undisturbed traffic flow, limited access possibilities and finally limited or even shrinking budgets have led to a development of an assessment model well fitted to the construction sector. Ambient vibration monitoring, which provides the opportunity to obtain useful data under ambient conditions for the assessment of structures and components, is the backbone of structural assessment monitoring and control. Nevertheless there is little available on this subject for the practising engineer. This book enables the practising engineer to learn about this