  We are concerned with input-to-state stability (ISS) of randomly switched
systems. We provide preliminary results dealing with sufficient conditions for
stochastic versions of ISS for randomly switched systems without control
inputs, and with the aid of universal formulae we design controllers for
ISS-disturbance attenuation when control inputs are present. Two types of
switching signals are considered: the first is characterized by a statistically
slow-switching condition, and the second by a class of semi-Markov processes.
