This paper analyses the emergence of new political forces in the Autonomous Communities and their impact on the governmental system. The first thing we observe is that despite this new situation, power strategies have changed little and the new parties soon integrated into the dynamics of the system. It is true that we live in new parliamentary times in which the pluralism of groups is much more significant, but this has not generated great institutional instability. Stability is ensured probably not only due to the electoral system but also parliamentary rationalization which means that, after the investiture, the Government has an "overload" with which to control political and, in particular, parliamentary life.
new political parties; form of government; parliamentary rationalization; electoral system