  The motivation for radio pulsar timing and its basic principles are reviewed.
Present and future radio timing techniques and hardware are summarised and
compared. The array of present timing programmes and their scientific goals are
collated and described. Recent results and future prospects are discussed, with
emphasis on multi-wavelength techniques where appropriate. Timing of radio
pulsars at other wavelengths is summarised along with the provision of
contemporary ephemerides for timing and searches at other wavelengths.
