Analysis and Optimization of Systems: State and Frequency Domain Approaches for Infinite Dimensional Systems : Proceedings of the 10th International Conference Sophia Antipolis France June 9 12 1992 This volume contains the proceedings of the conference state and Frequency Domain Approaches to Infinite Dimensional Systems . The aim was to bring together engineers and mathematicians working in the field of linear infinite dimensional systems who are specialists in one or more of the following categories of mathematical approaches: semigroup approches p.d.e. approaches frequency domain approaches and syntheses of state space and frequency domain approaches. Since these approaches use very different sophisticated mathematical techniques it is unusual for a scientist to be expert in all of them. On the other hand there different approaches all purport to address the same control problems for the same classes of linear infinite dimensional systems. It is therefore important to compare and discuss the advantages and disadvantages of these different mathematical techniques. To help ameliorate the communication gab a series of introductory tutorial lectures were given by specialists in the above mentioned fields. There were complemented by some key survey papers on more recent research as well as by papers representing original research in these areas