  A review of recent observations of the kinematics of six objects that
represent the broad range of phenomena called planetary nebulae (PNe) is
presented. It is demonstrated that Hubble-type outflows are predominant,
consequently it is argued that ballistic ejections from the central stars could
have dominated the dynamical effects of the fast winds in several, and perhaps
all, of these objects. An alternative possibility, which involves an extension
to the Interacting Winds model, is considered to explain the dynamics of
evolved planetary nebuale.
