  This chapter reviews for each province and destination of the Solar System
the representative space missions that will have to be designed and implemented
by 2061 to address the six key science questions about the diversity, origins,
workings and habitability of planetary systems (described in chapter 1) and to
perform the critical observations that have been described in chapters 3 and
partly 2. It derives from this set of future representative missions, some of
which will have to be flown during the 2041-2061 period, the critical
technologies and supporting infrastructures that will be needed to fly these
challenging missions, thus laying the foundation for the description of
technologies and infrastructures for the future of planetary exploration that
is given in chapters 5 and 6, respectively.
