The physics programme for a coming electron linear collider is dominated by events with final states containing many jets. We develop in this paper the opinion that the best approach is to optimise the independent measurement of the tracks in the tracker, the photons in the electromagnetic calorimeter and the neutral hadrons in the camorimetry, together with a good lepton identification. This can be achieved with a high granularity calorimetry providing particle separation, through an efficient energy flow algorithm.
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