This volu e contains the complete proceedings of the second NATO
Advanced Study Institute organised to relate co uni- cation theory with
allied subjects, and thus to single out themes which, though peripheral
at present, are gaining in importance because of recent developments in
theoretical investi- gations by communication experts. In 1974 we
attempted to promote an interchange of ideas between specialists in
Signal Processing and in Control and System Sciences *. This time we
tried to concentrate on probabilistic aspects of communication theory
and practice and of the allied science of random process theory, with
its novel and exciting approach to the mathematical foundations of noise
phenomena. The topics presented here have been chosen with the above in
view, to enlarge ideas and to diffuse results in the two allied
subjects, by providing the opportunity for gaining insight in depth into
new developments. These topics fall broadly into 10 distinct parts. Each
starts with two or more basic presentations of a tutorial nature,
followed by one or more detailed exa inations of particular aspects of
the subject. In addition, some parts are concluded with reports of panel
dis- cuss ons organised to consider a particularly pertinent issue.