They award a proportion of the seats available on a majoritarian basis (i.e. using
FPTP) with the remainder being allocated on a proportional basis (e.g. party list)
Hybrid systems seek to retain the strong MP-Constituent
link and majority government commonly associated with
majoritarian systems, while introducing more voter choice &
a greater degree of proportionality
FPTP-top-up is a variant of AMS that is used in
the elections to the Scottish Parliament, Welsh
assembly and Greater London assembly.
AV+ is the system proposed by the Jenkins Commission
AMS is the system used in Germany. 50% of
the seats are allocated under FPTP, with the
remainder distributed proportionally. There
is a threshold of 5% which parties must
cross before they are entitled to any
additional seats.