The Joint European Torus (JET) is the largest single project of the coordinated fusion research programme of the European Atomic Energy Community (EURATOM). JET's main objective. is to obtain and study plasmas in conditions and with dimensions approaching those needed for a fusion reactor (ie. ni 2x1020m-3; Ti>~ 10keV, and τE = 1-2s). Since the first operation of JET in June 1983 there has been steady progress in improving the plasma operating conditions. Discharges with the full design value of the toroidal field BT 3.4T and with plasma current Ip up to 5.1MA are now obtained routinely. Experiments with ion cyclotron resonance heating (ICRH) started in 1985 with two antennas and coupled powers up to 6MW. A third antenna was added in 1986 and the coupled power is now being raised towards 9MW. These experiments use H and 3He minority heating schemes in D plasmas. Experiments with neutral beam injection heating (NBI) started in 1986 with a single beam line capable of operating at energies up to 80keV with either Ho (up to 5MW) or Do (up to 9MW) of neutral beams injected into H+ or D+ plasmas. The maximum total power input (ie. ohmic+ ICRH + NBI).