  At the future electron-positron TeV linear collider, the reachable physics
will be strongly dependent on the detector capability to reconstruct high
energy jets in multi-jet environment. At LEP, SLD experiments, a technique
combining charged tracks and calorimetric information has been used to improve
the jet energy/direction reconstruction. Starting from this experience, it has
been proposed to go from partial individual particle reconstruction to complete
(or full) individual reconstruction. Different studies have shown that the
reachable resolution is far beyond any realistic hope from calorimetric-only
measurement.
