  Although less studied than purely action or state based logics, state/event
based logics are becoming increasingly important. Some systems are best studied
using structures with information on both states and transitions, and it is
these structures over which state/event based logics are defined. The logic
UCTL and its variants are perhaps the most widely studied and implemented of
these logics to date. As yet, however, no-one seems to have defined UCTL*, a
trivial step but a worthwhile one. Here we do just that, but prove in the cases
of both UCTL and UCTL* that these logics are no more expressive than their more
commonplace fragments. Also, acknowledging the importance of modal transition
systems, we define a state/event based logic over a modified modal transition
system as a precursor to further work.
