  The Shapley-Shubik index is a specialization of the Shapley value and is
widely applied to evaluate the power distribution in committees drawing binary
decisions. It was generalized to decisions with more than two levels of
approval both in the input and the output. The corresponding games are called
$(j,k)$ simple games. Here we present a new axiomatization for the
Shapley-Shubik index for $(j,k)$ simple games as well as for a continuous
variant, which may be considered as the limit case.
